History GoneHorriblyRight / WesternAnimation

** In "[[Recap/AvatarTheLastAirbenderAvatarDay Avatar Day]]", the gang stumbles upon a village while they're having an anti-Avatar celebration because Avatar Kyoshi killed their leader some 400 years ago. Aang wants to stand trial for her because he's sure she shared his ThouShallNotKill rule (which she didn't). Katara and Sokka go to nearby Kyoshi Island to prove she didn't kill him and piece together what happened. Katara comes up with the idea to have Aang wear her clothes to summon her to say she didn't kill the guy. He is able to summon her spirit, but she says that she did kill him. For the record, she didn't actually kill him, he chose not to move and [[DisneyVillainDeath fell to his death]]. She later tells Aang that she didn't see the difference between what she did and killing him because she was willing to kill him. Aang gets sentenced to be boiled in oil, but once trouble comes around, the Mayor lets him off with community service.

** In "The Abrasive Side", [=SpongeBob=] has a difficult time saying no to others. As a result, Gary orders an abrasive side for [=SpongeBob=] which helps him say no. Unfortunately, when someone requests him to do something, the abrasive side turns around and just doesn't reject the request but adds insults and cold remarks leaving the characters baffled and sad, like when he insisted that Mr. Krabs paid him overtime, Mr. Krabs had to look up the meaning of overtime on a dictionary. Luckily, Sandy catches on to this and a few other friends help him remove the abrasive side, it did hurt a lot for [=SpongeBob=] though.

** In "[[Recap/ArthurS11E1SweptAwayGermophobia Germaphobia]]", everyone has gotten sick of Buster's [[ThePigPen unhygienic behavior]] and wants to put an end to it. They start off by trying to get Arthur to convince him to end his gross habits, but it fell flat (though to be fair, Arthur doesn't put much effort into convincing him). Later on, Brain explains to Buster that germs are capable of carrying diseases and shows him some germs under a microscope, but Buster just finds them amusing to look at. However, he has a dream where everyone is at the pool party he set up, and he dives down and finds a harmonic, but when he plays it, it forms a cloud of germs and scares all of his friends away. Buster wakes up, but has no become paranoid over germs. He hallucinates hearing them laugh, panics after seeing his mother pick up an eggshell she dropped and put it in the trash and arrives to school wearing hockey gloves. His paranoia comes into full force at his pool party where he has everyone whom he invited take a shower first. It was at that moment the group realize that their actions are what caused Buster to become a hardened germaphobe.

** In "The Abrasive Side", SpongeBob has a difficult time saying no to others. As a result, Gary orders an abrasive side for SpongeBob which helps him say no. Unfortunately, when someone requests him to do something, the abrasive side turns around and just doesn't reject the request but adds insults and cold remarks leaving the characters baffled and sad, like when he insisted that Mr. Krabs paid him overtime, Mr. Krabs had to look up the meaning of overtime on a dictionary. Luckily, Sandy catches on to this and a few other friends help him remove the abrasive side, it did hurt a lot for SpongeBob though.

--->''"Let justice prevail

** Parodied with Project Satan in "[[Recap/FuturamaS2E18TheHonking The Holking]]", an attempt to create a sentient car using parts from the most evil cars in history (precisely why they did that is a mystery). It worked, unfortunately. The car was sentient, and indeed, almost giftedly intelligent, but ''pure evil'' (the first thing it did was kill the scientists who created it).

* In "[[Recap/TheNewBatmanAdventuresE23BewareTheCreeper Beware the Creeper]]", the Joker (upon learning that a TV news anchor is doing a story about the event that turned him into the Joker) decides to reenact the incident by shoving the anchor into the same vat of acid that created him. He succeeds, as he gets away while Batman and Robin try to save him. Unfortunately for Joker, the anchor he shoved turns into the Creeper, a more heroic version of the Joker who's even crazier than he is and becomes one of the only people that the Joker fears.

* ''WesternAnimation/TheAmazingWorldOfGumball:''

* ''WesternAnimation/TheBatman''

* ''WesternAnimation/BatmanTheAnimatedSeries''

* In ''WesternAnimation/BatmanBeyond'', Derek Powers apparently taught Paxton Powers to be ruthless in acquiring power. Let's just say that Paxton took it to heart and backstabbed his old man in the latter's final appearance.
* ''WesternAnimation/TheBatman''
** "[[Recap/TheBatmanS3E13GothamsUltimateCriminalMastermind Gotham's Ultimate Criminal Mastermind]]" features Dr. Hugo Strange creating an AI with the personality and intellect of all of Gotham's greatest criminals, for the purpose of understanding them better. Not only does it escape and create a body, but it embarks on a series of schemes that are both [[CardCarryingVillain Card-Carrying]] and savvy, and kicks Batman's ass. [[spoiler:[[ExploitedTrope Strange knew this would happen]], and wanted to test Batman]].
** "[[Recap/TheBatmanS5E10TheEndOfTheBatman The End of the Batman]]" introduces Wrath and Scorn, a villainous pair of brothers who want to gain favors from Gotham's criminal underworld (including the Joker) to help them [[spoiler: with their goal of taking down Batman]]. They get the attention they want from Gotham's worst, but at a cost. The Joker doesn't like anyone ruining his fun, and he especially doesn't like someone [[spoiler:trying to kill Batman (which [[TheOnlyOneAllowedToDefeatYou is his life's goal]]). So, when Batman and Robin inevitably defeat the brothers, Joker shows up and [[AFateWorseThanDeath Jokerizes]] them so that they'll never reveal Batman's secret identity]].

* In the ''WesternAnimation/OneHundredAndOneDalmatianStreet'' episode "Long Tongue Day", Dolly & Dylan spread a rumor about a Camden Kraken so the pond will be empty for them and the other Dalmatians to swim in. However, their plan works too well, as all the other Dalmatians get scared of the kraken, and the pond gets closed off to the public because of it.

* Happens at least twice to the titular character of ''WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius''. Involving the same invention no less.
** In the first instance, tired of being bullied and beat up at school, Jimmy designs a pair of nanobots (to provide checks and balances and avoid this trope) to pilot an attack drone and act as his protectors. At first, the bots are a complete success, using their weapons to drive off Jimmy's bully. Unfortunately, the overzealous bots begin to regard ANYONE as a potential threat to their creator, zapping the other children and adults indiscriminately if they get too close to Jimmy. Before they can find a way to permanently seal him in a protective area, Jimmy is forced to neutralize the ship and imprison the bots for everyone's safety.

* ''WesternAnimation/AmericanDad:''
** In "Escape from Pearl Bailey," Steve's friends, jealous of all the time Steve is spending with his girlfriend Debbie, particularly after he assists her in campaigning for class president against AlphaBitch Lisa Silver, design a slam page against Debbie while framing Lisa's clique for the deed to ruin her campaign and free up Steve's time. However, they failed to anticipate that Steve would go on a RoaringRampageOfRevenge against those that he believed responsible, disfiguring and otherwise humiliating them.
** In "Dope & Faith", Stan tries to force his new friend Brett to believe in God. After his mundane attempts fail, Stan decides to ruin Brett's life in hopes he'll turn to God. Stan destroys Brett's house, poisons the food at his restaurant in order to get it shut down, and brainwashed his wife into leaving him (for a woman) and taking the kids. Instead of turning to God, Brett jumps off a building. Brett comes back and declares that he now believes in God...because he died and met God, who sent him to Hell for committing suicide. He made a DealWithTheDevil to return to Earth, and is now a devout Satanist.
* ''{{WesternAnimation/Amphibia}}'': [[spoiler: Marcy's intention to bring her friends to Amphibia so they would stay together almost went wrong in "True Colors" once Sasha turned on the group and declared she was staying. Of course, this was prior to Anne and Sasha learning the truth of what Marcy did.]]
* In episode three of ''WesternAnimation/{{Arcane}}'', Powder, wanting to help her sister, Vi, and adoptive brothers, Mylo and Claggor, save their adoptive father, Vander, combines the hex-crystal with her monkey bomb to use as a weapon against [[BigBad Silco]]'s forces, which she unleashes just as Deckard, currently under the effects of [[FantasticDrug Shimmer]], is breaking down the metal door her family is hiding behind. The bomb works, and the ensuing explosion sends Deckard flying... [[spoiler:but also ends up killing Mylo and Claggor, and also ends up injuring Vi and Vander enough that the latter is forced to perform a HeroicSacrifice to save the former. Once Powder finds Vi, she's ecstatic about the fact that one of her bombs finally worked, only to immediately break down crying when she sees the consequences of it]].
* ''{{WesternAnimation/Arthur}}'':
** In "Germaphobia", everyone has gotten sick of Buster's unhygenic behavior and wants to put end to it. They start off by trying to get Arthur to convince him to end his gross habits, but it fell flat (though to be fair, Arthur doesn't put much effort into convincing him). Later on, Brain explains to Buster that germs are capable of carrying diseases and shows him some germs under a microscope, but Buster just finds them amusing to look at. However, he has a dream where everyone is at the pool party he set up, and he dives down and finds a harmonic, but when he plays it, it forms a cloud of germs and scares all of his friends away. Buster wakes up, but has no become paranoid over germs. He hallucinates hearing them laugh, panics after seeing his mother pick up an eggshell she dropped and put it in the trash and arrives to school wearing hockey gloves. His paranoia comes into full force at his pool party where he has everyone whom he invited take a shower first. It was at that moment the group realize that their actions are what caused Buster to become a hardened germaphobe.

** In one episode, an Earth Kingdom general wishes to use Aang's [[SuperMode Avatar State]] as a weapon. Failing to find a way for Aang to control when he can transform, he tries to provoke it by seeming to threaten Katara's life, and gets his wish. Let's just say that his look of triumph quickly transforms into a look of OhCrap before [[CurbStompBattle destruction ensues...]]
** In "Avatar Day", the gang stumbles upon a village while they're having an anti-Avatar celebration because Avatar Kyoshi killed their leader some 400 years ago. Aang wants to stand trial for her because he’s sure she shared his ThouShallNotKill rule (which she didn't). Katara and Sokka go to nearby Kyoshi Island to prove she didn’t kill him and piece together what happened. Katara comes up with the idea to have Aang wear her clothes to summon her to say she didn’t kill the guy. He is able to summon her spirit but she says that she did kill him. For the record, she didn’t actually kill him, he chose not to move and [[DisneyVillainDeath fell to his death]]. She later tells Aang that she didn't see the difference between what she did and killing him because she was willing to kill him. Aang gets sentenced to be boiled in oil but once trouble comes around, the Mayor lets him off with community service.
** Avatar Kyoshi made a deal with the Earth King of the time to protect Ba Sing Se's cultural heritage. She created an elite group of Earthbenders that will eventually be known as [[SecretPolice the Dai Li]]. Unfortunately, the Dai Li became corrupt, removing anything or anyone that pose a single threat to the city's peace. This includes spying on its own citizens and isolating the Earth King from the outside world. The worse is closing its walls and hiding the existence of the 100 years war with the Fire Nation, depriving the world of a much-needed ally in Ba Sing Se.
** Azula's [[DaddysLittleVillain faithfulness to her father]] pays off in the end. Her prize? She gets to become Fire Lord of the Fire Nation, which is what she wanted. However, her father Lord Ozai, goes on to declare himself the Phoenix King of the entire planet, making her title useless and all her effort throughout the series a waste of time. When you consider [[spoiler: that Azula's ambition cost her the only two friends she had; possibly her brother's love; and the perception that her own mother hates her, It's no wonder why she has a mental breakdown at the end of the series]].
** Zuko lampshades this to Ozai [[spoiler:after meeting him in prison in the series finale. Ozai's justification for burning his son's eye and then banishing him was that "suffering would be [his] teacher." And it was a great teacher... a teacher that showed Zuko the evils committed by the Fire Nation and prepared him to lead the Fire Nation in the complete opposite path. Zuko even praises his father for banishing him, as [[AbusiveParent it was the only good thing he ever did for his son]]]].
** In ''WesternAnimation/TheLegendOfKorra'''s third Book, the [[BombThrowingAnarchists Red Lotus]]'s plan is to capture Avatar Korra, administer a poison to force her into the [[SuperMode Avatar State]], [[spoiler:and then kill her, which will break the cycle of reincarnation for good.]] They succeed at the first two. Unfortunately for them, a PhysicalGod -- even a poisoned one -- is ''extremely'' hard to restrain. [[spoiler:Korra breaks free from ''platinum'' chains and commences a RoaringRampageOfRevenge that very nearly reduces their leader to a stain on the mountainside.]]

** Rupert Thorne tries to blackmail Harvey Dent by threatening to ruin his political campaign as DA by exposing the fact that he has a suppressed and violent alternate personality named Big Bad Harv. It doesn't quite work the way he planned for it to work.
--->'''Harvey Dent''': There's just one problem.\\
'''Rupert Thorne''': What's that?\\
'''Dent''': ''([[EvilSoundsDeep Switching to his "Big Bad Harv" voice]])'' You're talking to the wrong Harvey.
** H.A.R.D.A.C.'s last remaining robot duplicate was a copy of Bruce Wayne/Batman, which H.A.R.D.A.C. programmed to flawlessly replicate in every conceivable detail to successfully replace Batman. Unfortunately for H.A.R.D.A.C. [[CopiedTheMoralsToo that also included his moral code]], and when the replacement robot believes he's killed the real Batman and therefore [[ThouShaltNotKill taken a life]] his resulting guilt leads him to terminate both H.A.R.D.A.C. and himself.
** Project Gilgamesh was designed to create the ultimate warrior.
--->'''Batman''': They got more than they bargained for. . . They got BANE!
** In one episode, Scarecrow used a variant of his fear toxins on Batman that took away his fear and inhibitions. It worked all right. Too bad for Scarecrow that it actually made Batman/Bruce Wayne far more of a threat to Scarecrow and possibly anyone else in proximity than ever before due to the same toxin also removing his restraint against killing.
** In the episode [[Recap/BatmanTheAnimatedSeriesE25TheClockKing "The Clock King"]], Mayor Hill's advice to Fugate tried to make him [[EmotionsVsStoicism less stoic and more emotional]]. ''It worked''. 7 years later, the only emotional activity Fugate indulges is trying to make Hill look like a fool, and then kill him.

** The episode "Gotham's Ultimate Criminal Mastermind" features Dr. Hugo Strange creating an AI with the personality and intellect of all of Gotham's greatest criminals, for the purpose of understanding them better. Not only does it escape and create a body, but it embarks on a series of schemes that are both [[CardCarryingVillain Card Carrying]] and Savvy, and kicks Batman's ass. [[spoiler:[[ExploitedTrope Strange]] ''[[ExploitedTrope knew]]'' [[ExploitedTrope this would happen]], and wanted to test Batman]].
** The episode "The End of Batman" introduces Wrath and Scorn, a villainous pair of brothers who want to gain favors from Gotham's criminal underworld (including the Joker) to help them [[spoiler: with their goal of taking down Batman]]. They get the attention they want from Gotham's worst, but at a cost. The Joker doesn't like anyone ruining his fun, and he especially doesn't like someone [[spoiler: trying to kill Batman (which [[TheOnlyOneAllowedToDefeatYou is his life's goal]]). So, when Batman and Robin inevitably defeat the brothers, Joker shows up and [[AFateWorseThanDeath Jokerizes]] them so that they'll never reveal Batman's secret identity.]]
* Combines with GoneHorriblyWrong: In ''WesternAnimation/BeastWars'', the Maximals wanted a supersoldier with an immortal spark like Starscream's. They got it...in the form of the [[AxCrazy psychotic]], GeniusBruiser, [[ImAHumanitarian cannibalistic]], OmnicidalManiac Rampage.
** Megatron captured Rhinox and gave him an aggression boost to turn him into a Predacon. And he was very successful. So much so, that Rhinox staged a very efficient, very clever, very treacherous takeover, [[TheStarscream just like competent and ambitious Predacons have a tendency to do]]. Optimus knows this will happen. He spends most of the episode watching the chaos. [[spoiler:This comes back in sequel series ''WesternAnimation/BeastMachines'', after Megatron reformats him into Tankor. It seems he's learned this time, however, since he has a contingency plan in case Tankor turns traitor.]]
** [[TheStarscream Starscream]] possessed Waspinator and takes Blackarachnia to be his protege to be the best lying, cheating, backstabbing bastard she can be. It doesn't end well:
--->'''Starscream!Waspinator''': YOU BETRAYED ME!\\
'''Blackarachnia''': [[BastardUnderstudy I studied with the master.]]
* ''WesternAnimation/CodeLyoko'': Almost happened in "Hot Shower". [[BigBad XANA]]'s plan (using a satellite to alter the path of a comet, in order to use it to destroy the academy and the factory) almost ended up like this; the only way to prevent it was for Aelita to de-virtualize herself and to put herself in mortal danger. XANA aborted its plan and destroyed the comet, as it needed Aelita alive.
* ''WesternAnimation/CodenameKidsNextDoor'': When Rainbow Monkey Corporation scientists tried to make a Rainbow Monkey that looked like them, it became a nerdy-looking plush toy no child from test groups wanted to hug. They were so ashamed of making such a monkey they sent it to space.
** In "Operation [=HUGS=]", Numbuh 4 was banished to Rainbow Monkey Island to learn how to like Rainbow Monkeys. There, he meets the giant gorilla-like Rainbow Monkey Kong, who like all Rainbow Monkeys is very childish, immature, and huggable despite its monstrous appearance. Numbuh 4 is greatly annoyed by this so he [[TeachHimAnger teaches the Kong how to act like a real monster and be dangerous.]] Thanks to Numbuh 4, the Rainbow Monkey Kong becomes '''so''' ferocious and threatening that it goes on a berserk rampage all over the city and attacks the Sector V treehouse.
** Also Father's [[spoiler: delightfulization of Sector Z. He even [[LampshadeHanging lampshades]] the trope by name when describing what happened, though he seemed quite pleased with the end result regardless.]]
* ''[[WesternAnimation/WatchMyChops Corneil & Bernie]]'':
** Bernie takes Corneil to an animal intelligence test building. After Corneil ends with average scores for two tests, he decides to rush through the third test and arrives at a perfect score. Unfortunately, the scientist reviewing Corneil's results claims he performed so admirably his intellect level would be high enough allowing him to ''talk'', forcing Corneil to sabotage the machine to hide his secret.
** In one episode, Bernie asks Corneil to dress up as an alien to terrify Romeo, then later he gets Corneil to perform in front of everyone at the school. Romeo and a handful of students then try to catch him, and TheMenInBlack show up to apprehend Bernie for questioning how he was able to understand the "alien".

** In "Dexter's Assistant," Dexter needed an assistant to help him with his newest invention for a science fair. So he took Dee Dee and replaced her brain (which was the size of chewing gum) and replaced it with a new one that made her smarter. Now Dee Dee is much smarter than Dexter is, and knew more about his invention than he did. Later, she left Dexter and won the science fair with her own invention.
** In "The Way of the Dee-Dee," Dee Dee spends the entire episode teaching Dexter to loosen up and have fun, which ends with him going on a destructive rampage in his own lab [[LaughingMad with psychotic glee]]. She runs out of the lab crying after apologizing to Dexter.

** In "The Continuum of Cartoon Fools," Dexter desperately tried to stop Dee Dee from entering his lab by destroying or blocking all the entrances to it. In the end, he's finally succeeded by locking up his bookcase and [[SwallowTheKey swallowing the key.]] Dee Dee then points out that nobody is indeed getting into his lab. Dexter then quickly realizes that he's locked himself out as well.
** This happened to Dexter a lot. Another episode had him creating a robotic assistant with the intention of it raising the efficiency of his lab and overall productivity. Unfortunately, observing Dexter's need for sleep and nourishment as ineffective when compared to itself, the robot proceeded to take over the lab, improving on its design and ultimately rendering its creator obsolete (and thus needing to be removed). In a bit of a TakeThat towards Dexter's own single-mindedness, Dee Dee ultimately destroys the robot via LogicBomb because she can't tell the difference between it and her brother.

* Not an experiment per se, but in one of the ''WesternAnimation/EarthwormJim'' side stories, Bob the Killer Goldfish is trying to get his fish minions to wreak havoc, unfortunately, his minions are, well, fish. A fashion designer stumbles upon this and offers his services to help inspire them to havoc. After several failed attempts with Bob humiliating himself with stupid outfits, he orders his cat minion to wallop the pretentious fashion guy as a demonstration. Now knowing how he wants them to wreak havoc, one of the fish minions proceeds to wallop Bob.

** "Death is a Bitch" has Peter, worried he has cancer, checked out by the doctor. The doctor confirms Peter is healthy, then gives him a very large bill. Peter writes "deceased" on the bill, to avoid paying. He doesn't have to pay the bill, but Death turns up to collect him, since after all, he is deceased. Oops.
** "I Am Peter, Hear Me Roar" has Peter make sexually inappropriate jokes to a female co-worker, and to avoid being fired from his job and getting sued, Peter is forced to learn how to be more sensitive towards women. It takes Peter to be forced to attend a women's retreat camp to understand how women feel. Several weeks later, Peter is no longer insensitive towards women, but his demeanor has changed to become a woman's (even to the point where Peter thinks he has breast cancer and is upset that he can't get pregnant). This upsets Lois because Peter is too caught up in his own feelings instead of tending to Lois' feelings. Things return to normal when Lois gets into a fight with another woman, which gets Peter aroused and drags Lois home to have sex, thus returning Peter to his misogynist self.
** "The Cleveland-Loretta Quagmire" depicts Cleveland's wife Loretta cheating on him with Quagmire, which Cleveland, in his typical mild-mannered way, simply takes in stride. Peter, hoping to stop him from bottling up his emotions and give him a "revenge lay," attempts to get him to express how he really feels, but when he goes so far as to act out Loretta and Quagmire's affair with an unwilling Brian right in front of him, Cleveland unexpectedly snaps and vows to kill Quagmire, leading Peter to a rare MyGodWhatHaveIDone moment.
** The episode "Boy (Dog) Meets Girl (Dog)" has a double-whammy. When Peter and Lois fail to convince Chris that Arthur Valentine, a Santa-like character they invented to cheer him up as a kid, isn't actually real, they try to get him to stop believing by witnessing Arthur's "death" (by Lois running over a dummy with her car). However, they only succeed in [[HeroicBSOD mentally destroying him]], so they try to snap him out of it by having Peter dress up as "Arthur" and make it appear that he had come back to life. The plan works, but Chris now believes that "Arthur" has become a zombie and tries to kill him.

** Parodied with Project Satan, an attempt to create a sentient car using parts from the most evil cars in history (precisely why they did that is a mystery). It worked, unfortunately. The car was sentient, and indeed, almost giftedly intelligent, but ''pure evil'' (the first thing it did was kill the scientists who created it).
** A similar joke was used with [[RoboticPsychopath Roberto]] in ''[[WesternAnimation/{{Futurama}} Bender's Game]]'':
--->'''Roberto:''' I was built by a team of engineers tryin' to create a criminally insane robot. But it seems...[[BlatantLies they failed!]]\\
'''Vending Robot:''' [[LampshadeHanging Umm...actually...]] ([[IResembleThatRemark *gets shanked*]])
** The Planet Express Ship is secured with an Unbreakable Diamond Tether. Although it didn't do a very good job securing the ship, it did prove to work as advertised in the sense that it was unbreakable, dragging the whole building along with the ship. They also used it as a fishing line once. They caught a leviathan of some sort, and it dragged the whole ship to the bottom of the sea.
** In "Benderama", Bender attempted to use Professor Farnsworth's fun-size duplicator to duplicate himself to do a menial task for the Professor. The two duplicate Benders were just as lazy as Bender, and just as smart, coming up with the same solution, ad infinitum until a GreyGoo scenario began.

** In the episode "Double Dipper", Dipper uses a magic copy machine to create a small army of clones to enact a [[ObsessedAreTheListMakers highly]] [[ComplexityAddiction convoluted]] plan to get a dance with Wendy at a party. Problem was, while the clones were setting things up, he and Wendy end up hitting it off by just talking, causing Dipper to realize that he doesn't need a plan, but to just be up-front. The Dipper clones, however, insist on using the plan, and so they lock Dipper in the closet, to keep him from screwing it up.
** The programmers of ''Romance Academy 7'' set out to create the perfect DatingSim with the perfect digital girlfriend, and so [=.GIFfany=] was created... Unfortunately they programmed her ''too'' well, [[InstantAIJustAddWater accidentally creating a sentient AI,]] and when [[AIIsACrapshoot they realized what they had created]] and tried to delete her, [[CuteAndPsycho she]] [[DeadlyEuphemism deleted]] ''[[TurnedAgainstTheirMasters them]]'', instead... After that event [=.GIFfany=] became interested in one thing and one thing only: [[{{Yandere}} Being the perfect girlfriend to her designated boyfriend so that he'll never talk to another girl ever again.]]
** Another example occurs in the episode "A Tale of Two Stans": [[spoiler:Stanford "Ford" Pines]] thought that the anomalies in Gravity Falls were the result of an alternate dimension that was spilling into theirs. He built the portal to explore it and during the test his assistant [[spoiler: Fiddleford. H. [=McGucket=]]] gets sucked into the portal headfirst and emerges a little insane. He never says what he saw, but he was so haunted by it that he employs an extremely literal version of LaserGuidedAmnesia.

** In an episode, the normally ineffective robot GIR gets locked into "duty mode", which makes him actually competent. He quickly (and accurately) decides that the biggest obstacle to the Irken takeover of Earth is, in fact, Zim himself...
** "Bad Bad Rubber Piggy" has Zim using temporal interference [[ItMakesSenseInContext via toy rubber pigs]] to kill Dib by causing accidents to happen in his past. It works perfectly, and Dib dies... and then [[MadScientist his father]] revives him in titanium mecha suit. [[GoneHorriblyWrong Every attempt at interfering after that just causes the suit to get upgrades]]. Zim only manages to survive the episode by using his final rubber pig to write a message to himself, telling him not to use the time portal, thus hitting the ResetButton. Unfortunately, Zim only managed to stop himself because after the rubber pig was sent back, it ended up replacing his brain in the process, leaving him a mindless idiot.

* ''WesternAnimation/{{Jellystone}}'': "My Doggie Dave," Doggie Daddy can't handle being away from his daughter for more than a few seconds, so he and Augie create "Dave" to join on grown-up nights out. "Dave" ends up being so popular, Augie gets invited out for numerous other functions, leaving Doggie Daddy completely alone.

** In the episode "[[Recap/JusticeLeagueS1E18And19Legends Legends]]", a young man, [[spoiler:mentally scarred and mutated by a nuclear holocaust which destroyed his world and his superheroes the Justice Guild, used his new powers to recreate that idealistic society, forcing any who survived to be trapped in his fantasy or else... Eventually, the Guild discovers they are just figments of his mind and have a choice: allow his tyranny to continue and they themselves will live, or fight him and die for the world once more. They choose to be the heroes he imagined them to be, and die for the world once more]].
---> "Let Justice Prevail!"
** In the episode "Hereafter", Superman is sent to the future, where he discovers that Vandal Savage has succeeded in [[TakeOverTheWorld taking over the world]]. However, he [[ApocalypseHow accidentally wiped out all of humanity in the process]]. Being the ruler of a planet with nobody else on it has left the immortal man quite bored and immensely regretful of his actions. He built a spaceship and can leave Earth whenever he wants, but he chooses to stay on the planet he ruined in self-imposed exile to punish himself for his screw-up. He even helps Superman return to his own time [[SetRightWhatOnceWentWrong for the purposes of stopping him]].
** While most of [[GovernmentConspiracy Cadmus']] [[CapeBusters attempts to create countermeasures to destroy the league should they go rogue]] were cases of GoneHorriblyWrong, Doomsday was arguably a case of this in "The Doomsday Sanction". A creature created from Superman's DNA, conditioned to hate the Man of Steel and make his only purpose to kill him? That worked perfectly. Except for the fact that there's nothing that stops him from killing ''everyone else'' who gets in his way before he finds Superman (or after, for that matter).

** One episode had [[ItMakesSenseInContext Kaeloo try to seduce Mr. Cat so he could impregnate her]]; [[spoiler: he gets seduced [[AttemptedRape a bit too well]]...]]

* ''WesternAnimation/LegionOfSuperHeroes'': Imperiex, the BigBad of Season 2, wants Brainiac 5 to join forces with him; in order to corrupt him, he manipulates him into accessing and using the programming of the original, evil Brainiac. Shortly thereafter, Imperiex is a scattering of pixels and the show has a brand new Big Bad.
* In the ''WesternAnimation/LittlestPetShop2012'' episode "[[Recap/LittlestPetShop2012S3E4SecretCupet Secret Cupet]]", Sugar Sprinkles wants to spread love so she plays a song that hypnotizes pets into falling in love. Unfortunately for Penny Ling, Pepper, and Minka, this works too well and Russell, Sunil, and Vinnie respectively act ''very'' creepy towards them. [[spoiler: Subverted when Sugar Sprinkles says she actually ''prefers'' them this way and attempts to sing her song to them ''again'', and [[KarmaHoudini completely gets away with it]].]]

** The final scene in the animated short "Ready, Set, Zoom!" has Wile E. Coyote donning a female road runner costume to attract his prey. Unfortunately, there's about a hundred starving coyotes waiting behind those rocks.
** Another short ends up with the Coyote chasing the Road Runner through a series of smaller and smaller pipes, both ending up shrunken to the size of a bug. They both chase back into the pipe, the Road Runner returning to original height, while the Coyote remains shrunken. At first oblivious to this development, the Coyote jumps and grabs a hold of the Road Runner's leg. Then, after he looks in horror up at the gigantic Road Runner, looks to the audience while holding a sign saying "... you always wanted me to catch him... now what do I do?!?"

** Even [[TheAce the great]] WesternAnimation/BugsBunny wasn't immune to this. In ''WesternAnimation/BugsBunnyAndTheThreeBears'', he tries to DivideAndConquer the family by buttering up Ma Bear. Unfortunately for him, his flattery causes Ma to develop instant MrsRobinson tendencies, [[AbhorrentAdmirer sending Bugs]] [[NoGuyWantsToBeChased running for the hills]].
*** In the short "WesternAnimation/RebelRabbit," Bugs is offended that the bounty on rabbits is a mere two cents, compared to foxes and bears (who possess $50 and $75 bounties, respectively), on the ground that rabbits are "perfectly harmless" compared to them, and sets out to prove that rabbits can be just as bad, becoming a PersonOfMassDestruction by, among other things, selling Manhattan Island back to the Native Americans, filling in the Grand Canyon, and sawing the entire state of Florida off from the rest of the country. The end result: a bounty of one million dollars is placed on Bugs' head, and is hunted down by the entire US Army, who lock him up in [[TheAlcatraz Alcatraz]]:
--->'''Bugs:''' ''(as he's surrounded by artillery shells in a foxhole)'' Ehhh, could it be that I carried this thing too far? ''(the shells explode; fade to Bugs in a cell in Alcatraz)'' Ehhh, ''could'' be.
** In ''WesternAnimation/WhatsOperaDoc'', Elmer spends the entire cartoon trying to kill Bugs with his spear and magic helmet, but when he succeeds, he [[MyGodWhatHaveIDone isn't very happy about it]].

*** At the end of "WesternAnimation/MuzzleTough", in his final attempt to get Hector out of the way so he can steal Tweety, Sylvester [[FullBodyDisguise disguises himself]] [[AttractiveBentGender as a female dog]] so he can lure Hector out of the house and clobber him, but ends up being caught by the dog catcher. In the back of the van, Sylvester takes off his mask and demands to be let out, [[ThisIsGonnaSuck only to be confronted and attacked by a dozen other angry dogs]].

*** It once happened even in a show Pepe ''wasn't supposed to be part of''. In the Tweety and Sylvester short "WesternAnimation/DogPounded", Sylvester disguised himself as a skunk to scare away some dogs from a dog pound where Tweety was. It worked... until Pepe [[CrossoverPunchline appeared out of nowhere]].
*** Also one episode had Pepe trying as he might, as he does, to woo a "skunk". The two fall in a rain barrel and the paint gets washed off the cat's back, Pepe apologizes for soaking her, and walks away. The cat gets a glimpse of Pepe's [[BeautifulAllAlong surprisingly broad shoulders and firm physique]] and starts chasing ''him''. It's what he wanted, of course, except there's [[AbhorrentAdmirer nothing attractive about a wet cat]]. Sauce for the goose is sauce for the gander, Pepe!

** In "No Guts, No Glori", Mom and Dad go out on a date and leave Lori in charge, which annoys the siblings as she takes the fun away from her. So, Lincoln rallies them up to lock Lori in her room and leave Lincoln himself in charge. However, when he allows his siblings to have fun, they suddenly enjoy themselves so much they trash the whole place and decides to recruit Lori to get them under control again.
** In "Yes Man", Lincoln teaches his sisters how to butter up their parents to give them money for the things they want. His advice works for them, but the next time Lincoln tries to get money from his parents, they won't give him any because they gave it all to the girls.
** In [[HalloweenEpisode "Tricked!"]], Lincoln and Clyde encounter a pair of bullies while looking for a perfect place to trick-or-treat and Lincoln, not wanting them to know about their destination, convinces them that Franklin Avenue, his own street, is the ideal place to get candy. But when they get back home, they discover that the duo had wreaked havoc on the neighborhood and stole everybody's candy.
** In "Future Tense", {{new neighbours|AsThePlotDemands}} inspire Lynn Sr. and Rita to bring their kids to their full potential by enrolling them in classes and clubs to improve upon their shortcomings and have them take up community services. When the kids meet the parents' expectations, they want to do fun activities like eat ice cream or watch a movie, but the kids don't find them fun, considering them ineffectual for their well-rounded activities. Realizing they've gone too far, the parents apologize to the kids and decide to worry about their future later.

* ''WesternAnimation/MiraculousLadybug'': In a BadFuture shown in the episode "Cat Blanc", Hawk Moth succeeds in akumatizing Cat Noir and killing Ladybug. Unfortunately for him, the mentally unstable Cat Blanc proceeded to unleash an AngstNuke that killed Hawk Moth along with the rest of Paris.

* In ''WesternAnimation/TheNewBatmanAdventures'' episode "The Creeper", the Joker (upon learning that a TV news anchor is doing a story about the event that turned him into the Joker) decides to reenact the incident by shoving the anchor into the same vat of acid that created him. He succeeds, as he gets away while Batman and Robin try to save him. Unfortunately for Joker, the anchor he shoved turns into the Creeper, a more heroic version of the Joker who's even crazier than he is and becomes one of the only people that the Joker fears.
* ''WesternAnimation/PhineasAndFerb'': In "Phineas and Ferb's Quantum Boogaloo", adult Candace finally busts her brothers after going back in time... only to see how bad are the consequences after she returns to her present. She was expecting the boys would just get grounded for building a homemade rollercoaster, but her actions lead not only to enraged parents banning creativity for children, but also to Doofenshmirtz taking over the Tri-State Area because Candace inadvertently foiled one of Perry's plans to stop him. Thankfully, she manages to undo the BadFuture.

** In "Hurricane Neddy", Flanders suddenly erupts in a violent, angry rant at all his friends and neighbors for trying (albeit ''completely'' incompetently) to help him after his house was destroyed. After having himself committed we learn by flashback that his usually overly-friendly personality came as a result of an experimental psychological treatment he had as a child, back when he was so ''badly'' behaved and his parents, [[HandsOffParenting being beatnik stereotypes]], wouldn't actually do anything. "Yeah Doc, we've tried nothing and we're all out of ideas!" The end of the episode also hinted that Ned's therapy afterward might have resulted in this too (before {{Flanderization}} kicked in).

** Also parodied in the episode "That 90s Show". Homer visited Moe's Tavern back when it was a cigar bar in the 1990s while in a slump. When Barney ended up forcibly exhaling a huge plume of smoke from smoking his cigar a bit too fast, Moe attempted to use this as an opportunity to steal a watch from one of his customers. However, he couldn't get it off in time before the smoke dissipated. Moe, in order to evade a potential telling off/beating, tried to come up with the alibi that he was "coming on" to the customer. Turns out the customer was actually gay, and he said "okay, you can stay at my place.", meaning that his alibi to get him out of trouble worked too well as he was most likely inviting him over for gay sex. Cue Moe saying "Oh, boy." with a squicked expression.
** In "Mother Simpson", Homer fakes his death with a dummy so he could get out of a community service project held by Mr. Burns so he could spend time with his family. It worked, all right. Unfortunately, it also led to the rest of Springfield also believing that Homer had indeed died, that lasted until the Simpson house's power was cut due to it being registered in Homer's name, resulting in Homer clearing up the "Misunderstanding" after Marge forced him to.
** In "Homer the Smithers", Mr. Burns forces Mr. Smithers to take a vacation. Since Smithers likes his job and wants to avoid having this happen again, he looks for the most incompetent person possible to take his place, so naturally, he picks Homer. This turns out to work all too well, as Homer is so terrifyingly incompetent that he scares Burns into learning to take care of himself, so after Smithers comes back, Burns no longer needs an assistant and thus fires him.
** Milder example in "Itchy & Scratchy & Marge". Marge protests against the Itchy and Scratchy cartoons as setting bad examples for impressionable small children. Once she succeeds in convincing the company to eliminate violence on said cartoons literally turning it [[LighterAndSofter educational]], not only did the smaller kids learn to do positive things, the older children hated the new version of the cartoon so much that it resulted in all of the older kids of the neighborhood temporarily no longer watching television preferring the outdoors with having the enjoyment of mostly positive outdoors activities. Marge pleasantly admits it wasn't what she expected.
** In "Flaming Moe's," Bart prank-calls Moe's bar, which has become a high-class, upscale establishment due to the fame Moe has earned from stealing Homer's homemade recipe. Bart asks to talk to someone named "Hugh Jass"...only it turns out there actually is a customer there named Hugh Jass.
** In "Lemon of Troy", Marge attempts to instill a sense of town pride in Bart to stop him from vandalizing property. However, her lesson causes Bart to develop xenophobia for other towns, which leads him to rope his friends into a dangerous quest to take back Springfield's lemon tree from Shelbyville.
** In "The Old Man and the Lisa", Mr. Burns loses his wealth but regains it when Lisa teaches him about recycling, leading him to develop his own recycling plant which features "the Burns omni-net", a fishing net made of old six-pack rings that sweeps the ocean, turning the local sealife into an all-purpose slurry, to Lisa's horror.
** In "Bart Gets a Z", Bart wants Mrs. Krabappel to loosen up after she takes away everyone's cell phones for being too distracting. He does this by getting the entire class to gather alcohol to [[SlippingAMickey spike her coffee with]]. Ultimately, she ends up getting so drunk that [[FiredTeacher she loses her job over it]].

* On ''WesternAnimation/SouthPark'':
** The creators of Walmart sought to establish the ultimate convenience store chain, and ended up creating an all-consuming monstrosity that feeds on greed and rampant consumerism, enslaves the minds of its customers and employers, and brings misery and degradation to any settlements where it sets roots... We're still talking about the cartoon, right?
** In "Tweek x Craig", the eponymous couple are MistakenForGay and decide to stage a fake break-up to put an end to it. When Tweek protests that he's a terrible actor, Craig advises him to just "follow [his] lead and try and make it believable". Turns out Tweek is actually a ''far'' better actor than he gave himself credit for, and he gets caught up in the act and unintentionally makes Craig out to be a manipulative cheater.
** In "The Damned", [[UsefulNotes/HillaryRodhamClinton Hillary Clinton]]'s campaign managers train her to say "My opponent is a liar and should not be trusted" to anything Mr. Garrison says. However, they ''didn't'' expect Garrison to try to throw his campaign and say that Clinton is better off running the country than him, which proves detrimental to both campaigns.

** In "Texas", [=SpongeBob=] and Patrick mock Texas in front of Sandy so she can chase them and lure her to a party they're throwing for her. It's only afterward that they realize they've triggered UnstoppableRage in Sandy and they now have to run for their lives.
** In "Squilliam Returns", Squidward tells [=SpongeBob=] to "empty his mind" of anything that isn't about fine dining (and breathing). He does just that and ends up forgetting his own name as a result.
** In the episode "Mrs. Puff, You're Fired," Mrs. Puff is replaced as boating school teacher by a DrillSergeantNasty, who puts [=SpongeBob=] through TrainingFromHell to correct his DrivesLikeCrazy tendencies. Unfortunately, as a result of the new teacher's harsh drills and ''very'' specific teaching methods, [=SpongeBob=] can ''only'' drive correctly while blindfolded, and since he's legally forbidden to drive blindfolded, his boating test with the new guy fails as usual.
** In "Fear of a Krabby Patty", Plankton opens the Chum Bucket for 23 hours to manipulate Mr. Krabs into opening the Krusty Krab 24/7, so [=SpongeBob=] will eventually wear out to the point he has to hand him the formula. Well, not only is the sponge worn out after 43 days nonstop, he is somehow ''[[ShellShockedVeteran afraid of krabby patties]]''.
** In "Shellback Shenanigans", Plankton disguises himself as Gary to get into the Krusty Krab's "Bring Your Pet To Work Day" in his latest attempt to steal the secret formula. However, the plan works so well that not only is [=SpongeBob=] fooled, but the sight of "Gary" "turning green" and "talking" makes him think something's wrong, and sends him to the hospital where he believes he's terminally ill.
** In "Bumper to Bumper", Mrs. Puff comes up with a solution to help [=SpongeBob=] with his driving freak-outs, by having him repeat to himself, "[[MadnessMantra Focus on the road, there is nothing but the road.]]" He repeats the advice, and drives perfectly... unfortunately, it works too well, as he's now too focused on the road that he cannot park, and once they're off the road, he starts to panic.
* ''WesternAnimation/StarWarsRebels'' has a two-parter with Kanan teaching Ezra to open himself to the Force. He finally succeeds...and then gets a lot more than he bargained for when Ezra's fear and anger get the better of him and he gets his first taste of the Dark Side.
* In ''WesternAnimation/StarVsTheForcesOfEvil'':
** In "School Spirit", Star misunderstands when Marco tells her the football team is going to be "slaughtered" by their rivals (he just meant horribly defeated in the game). She booby traps the field, but when she learns the truth and all the traps start going off... [[MyGodWhatHaveIDone well, the quote at the top of the main page says it all.]]
** In "Cheer Up Star", Marco tries to lift Star's spirit by luring some monsters she can fight. He ends up bringing more than he wanted to.
** In "Hungry Larry", Star and Janna summon a monster named Hungry Larry to make Mr. Diaz's haunted house scarier. He does make things scarier, [[EvilIsNotAToy in the worst kind of way]].

*** Rhina later decides to get back at her abusive husband via a spell to cause a broken heart. The spell ''literally'' breaks his heart, causing him to instantly die of a heart attack. And since her husband's cousin was the king of the Underworld, this also strained the alliance between the Butterfly and Lucitor kingdoms.

** In the episode "Cat Fingers", Steven learns from Amethyst how to use his natural {{shapeshifting}} ability and uses it to turn his fingers into miniature cats. In the process of trying to get rid of them, they end up [[BodyHorror growing all over his body]] and he has to get help from his {{muggle|s}} dad to solve the problem.
** Peridot was conditioned by her superiors [[BigBadDuumvirate The Diamond Authority]] to be dictated by logic and reason, so when she eventually came to the conclusion that letting the Cluster destroy Earth would be illogical, she went through a ton of effort to attempt contact with the Diamonds and explain her reasoning, figuring they would agree. After some shenanigans, Peridot finally succeeded in contacting Yellow Diamond... and found out that Yellow Diamond's reasoning for destroying Earth was motivated by sheer spite rather than logic. Peridot promptly [[HeelFaceTurn jumped ship]].
** The Zircon Lawyer assigned to defend Steven (aka "Rose Quartz") in a trial before the Diamonds. Despite her initial worries, she's able to make a solid case after realizing the only reason a trial would even be occurring in the first place is that the Diamonds don't know what happened when Rose allegedly killed Pink Diamond either. She follows this line of reasoning to conclude that circumstances wouldn't have allowed Rose to kill Pink even if she wanted to and that only another Diamond could have shattered Pink. Yellow Diamond is so upset by the accusation that she poofs the Zircon, though she ultimately does live.
** In "Kevin Party", Kevin convinces Steven to bait Connie into making the first move in them reconciling with each other by giving her the cold shoulder treatment and pretending that he's doing great with her gone from his life. While the tactic does get the two to communicate with each other, Steven makes himself look so happy and content that it causes Connie to believe he's decided to cut her out of his life forever and move on with a new crowd of friends, sadly wishing him well after explaining the past month was a case of major miscommunication, and almost leaving the party in resignation of their broken friendship before Steven stops her.

* ''WesternAnimation/SupermanVsTheElite:'' The Elite spend most of the movie convincing people that [[ThouShaltNotKill Superman's morals]] are outdated and that [[WhyDontYaJustShootHim killing the bad guys]] is the new, better way of things, mocking Superman's protests. [[spoiler: When Superman [[BewareTheSuperman finally decides to buy what they've been selling]], words cannot begin to describe the horror they've unleashed. Subverted, as in the end it was revealed that it was [[ThePowerOfActing all an act]] meant to successfully convince people that the Elite's methods are flawed.]]

* ''WesternAnimation/TinyToonAdventures'': In one cartoon, Buster and Babs help a trio of unemployed black and white cartoon characters who haven't worked for decades and have been forced to sell their cartoon effects reclaim their fame. Buster and Babs succeed and end up creating a new show that could put THEM out of work.

* ''WesternAnimation/MenInBlack'': The villain Alpha, a human who regularly [[TheAssimilator stole alien parts to attach to himself]], decided to do so with a symbiote, giving him the symbiote's HealingFactor. He ultimately ended up stealing ''two''. It worked. It worked so well it caused his alien parts to ''grow new bodies'', tearing him to shreds as they pulled free from his body.

** Peridot was conditioned by her superiors [[BigBadDuumvirate The Diamond Authority]] to be dictated by logic and reason, so she eventually came to the conclusion that letting the Cluster destroy Earth would be illogical and promptly [[HeelFaceTurn jumped ship]].

* In ''WesternAnimation/TheSmurfs'' fourth season opener, "Symbols of Wisdom", Brainy Smurf and Gargamel decide independently to grow beards, thinking that wisdom comes from having a beard. Gargamel's magic hair tonic gives him such a long, thick and tough beard that it traps him inside his hovel. After Papa Smurf frees Gargamel, he and the other Smurfs discover that [[spoiler:Brainy is in a similar predicament]].

** In "Germaphobia", everyone has gotten sick Buster's unhygenic behavior and wants to put end to it. They start off by trying to get Arthur to convince him to end his gross habits, but it fell flat (though to be fair, Arthur doesn't put much effort into convincing him). Later on, Brain explains to Buster that germs are capable of carrying diseases and shows him some germs under a microscope, but Buster just finds them amusing to look at. However, he has a dream where everyone is at the pool party he set up, and he dives down and finds a harmonic, but when he plays it, it forms a cloud of germs and scares all of his friends away. Buster wakes up, but has no become paranoid over germs. He hallucinates hearing them laugh, panics after seeing his mother pick up an eggshell she dropped and put it in the trash and arrives to school wearing hockey gloves. His paranoia comes into full force at his pool party where he has everyone whom he invited take a shower first. It was at that moment the group realize that their actions are what caused Buster to become a hardened germaphobe.

** Megatron captured Rhinox and gave him an aggression boost to turn him into a Predacon. And he was very successful. So much so, that Rhinox staged a very efficient, very clever, very treacherous takeover, [[TheStarscream just like competent and ambitious Predacons have a tendency to do]]. Optimus knows this will happen. He spends most of the episode watching the chaos. [[spoiler:This comes back in sequel series WesternAnimation/BeastMachines, after Megatron reformats him into Tankor. It seems he's learned this time, however, since he has a contingency plan in case Tankor turns traitor.]]

* ''WesternAnimation/SavingMe'': The two Bennetts invent an anti-fear helmet to remove Sophie's fear of the monster in her closet. They end up making her so fearless she charges into open traffic and tries to take down a group of thieves despite being only armed with a bat.

** The episode "The End of Batman" introduces Wrath and Scorn, a villainous pair of brothers who want to gain favors from Gotham's criminal underworld (including the Joker) to help them [[spoiler: with their goal of taking down Batman]]. They get the attention they want from Gotham's worst, but at a cost. The Joker doesn't like anyone ruining his fun, and he especially doesn't like someone [[spoiler: trying to kill Batman (which [[TheOnlyOneAllowedToDefeatYou is his life's goal]]). So, when Batman and Robin inevitably defeat the brothers, Joker shows up and [[AFateWorseThanDeath Jokerizes]] them so that they'll never reveal Batman's secret identity.

* ''WesternAnimation/TheBatman'' episode "Gotham's Ultimate Criminal Mastermind" features Dr. Hugo Strange creating an AI with the personality and intellect of all of Gotham's greatest criminals, for the purpose of understanding them better. Not only does it escape and create a body, but it embarks on a series of schemes that are both [[CardCarryingVillain Card Carrying]] and Savvy, and kicks Batman's ass. [[spoiler:[[ExploitedTrope Strange]] ''[[ExploitedTrope knew]]'' [[ExploitedTrope this would happen]], and wanted to test Batman]].

%%* In the first season of ''WesternAnimation/TeenageMutantNinjaTurtles2012'', lazy wannabe hero "The Pulveriser" is determined to get his hands on a sample of the mutagen that has been turning various people into freaks, in hopes that it will give him superpowers. This, [[TooDumbToLive/WesternAnimation despite the fact that he is repeatedly warned that the mutagen would turn him into a horrifically deformed monster]]. The Turtles even try to deliberately keep the stuff away from him, but he steals it from them and takes it anyway. He gets superpowers, alright... the superpowers of being a HollywoodAcid-spewing BlobMonster who can never be cured. And then [[NeverMyFault he has the nerve to blame the Turtles for his transformation]], despite the fact they ''tried'' to stop him from destroying himself.

** Typically, whenever one of the AcmeProducts ''does'' work as advertised, their success manages to work against Wile E. rather than for him. For example, a Dehydrated Boulder, upon hydration, becomes so large that it squashes him, the Burmese tiger trap catches an actual Burmese tiger (in the North American desert?), or he finds out that the Earthquake Pills bottle label's fine print states that the pills aren’t effective on road runners... right after he swallows the whole bottle thinking they don't work.

*** It once happened even in a show Pepe ''wasn't supposed to be part of''. In the Tweety and Sylvester short "Dog Pounded", Sylvester disguised himself as a skunk to scare away some dogs from a dog pound where Tweety was. It worked... until Pepe [[CrossoverPunchline appeared out of nowhere]].

** In the short "WesternAnimation/RebelRabbit," Bugs is offended that the bounty on rabbits is a mere two cents, compared to foxes and bears (who possess $50 and $75 bounties, respectively), on the ground that rabbits are "perfectly harmless" compared to them, and sets out to prove that rabbits can be just as bad, becoming a PersonOfMassDestruction by, among other things, selling Manhattan Island back to the Native Americans, filling in the Grand Canyon, and sawing the entire state of Florida off from the rest of the country. The end result: a bounty of one million dollars is placed on Bugs' head, and is hunted down by the entire US Army, who lock him up in [[TheAlcatraz Alcatraz]]:

** Along with Sylvester himself, cats who intentionally pretend to be skunks end up [[AbhorrentAdmirer being chased]] by WesternAnimation/PepeLePew.

** Cats who intentionally pretend to be skunks end up [[AbhorrentAdmirer being chased]] by WesternAnimation/PepeLePew.

** In another episode, Jimmy upgrades the local [[BlandNameProduct [=McSpankies=]]] an automated order taking and kitchen system, as well as an AI that's programmed to adapt to maximize customer satisfaction. Unfortunately, after it hears Hugh go on about all the reasons he prefers Taco Shack, the [[AIIsACrapshoot AI]] determines that the best way to maximize customer satisfaction is to be the only source of food in Retroville.

*** Also one episode had Pepe trying as he might, as he does, to woo a "skunk". The two fall in a rain barrel and the paint gets washed off the cat's back, Pepe apologizes for soaking her, and walks away. The cat gets a glimpse of Pepe's [[BeautifulAllalong surprisingly broad shoulders and firm physique]] and starts chasing ''him''. It's what he wanted, of course, except there's [[AbhorrentAdmirer nothing attractive about a wet cat]]. Sauce for the goose is sauce for the gander, Pepe!

* This hits the ''WesternAnimation/YoungJustice'' version of Dr T.O. Morrow as well -- coming and going. First his attempts to create 'heroic' androids to infiltrate the superhero community and destroy them from within fail due to his creations being too heroic and sacrificing themselves or turning on him outright. Infuriated by this, he decides to create a final perfect android without any such moral inhibitions... who of course immediately turns on him and rips him apart.

* ''{{WesternAnimation/Arthur}}'': In "War of the Worms", Fern gets tired of Brain taking the fun out of her storytelling by correcting the facts, as does everyone else. She and her class learn about worms, which prompts her to ask about the possibility of worms growing after eating, which also prompts Brain to reject the notion. Inspired by Ratburn quoting Creator/CarlSagan[[note]]"Extraordinary claims require extraordinary evidence"[[/note]], Fern decides to fabricate evidence involving giant worms so that Brain will believe her story, digging large holes in the soccer field and borrowing all worm-related books from the library under the guise of a "secret anti-worm squad" to name a few. It does work... albeit a little too well, as Brain now thinks that Elmwood City is under threat of a potential worm invasion. At the end, Fern admits that it got a little out of control.