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* [[http://www.egscomics.com/?date=2003-06-27 Set up here]] in ''ElGoonishShive'' (the full exchange doesn't come until the next strip):
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* [[http://www.egscomics.com/?date=2003-06-27 Set up here]] in ''ElGoonishShive'' ''Webcomic/ElGoonishShive'' (the full exchange doesn't come until the next strip):
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* In an episode of ''{{Angel}}'', Wesley shoots somebody who turns out to be a robot double, to dramatic rather than comedic effect. The point in that case was not that Wesley makes a habit of casually killing people, but that in this one instance he was pushed over a line he wouldn't normally cross. [[spoiler: It was a robot duplicate of his ''father'', by the way...]]
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* In an episode of ''{{Angel}}'', ''Series/{{Angel}}'', Wesley shoots somebody who turns out to be a robot double, to dramatic rather than comedic effect. The point in that case was not that Wesley makes a habit of casually killing people, but that in this one instance he was pushed over a line he wouldn't normally cross. [[spoiler: It was a robot duplicate of his ''father'', by the way...]]
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* The player gets an opportunity to have his own How Did You Know? moment in the (chronological) beginning of ''MaxPayne 2''. No game mechanic prevents you from killing an innocent bystander at a crime site, a cleaner. In fact, you will be rewarded for doing so by him not leading you into an ambush.
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* The player gets an opportunity to have his own How Did You Know? moment in the (chronological) beginning of ''MaxPayne 2''.''MaxPayne2''. No game mechanic prevents you from killing an innocent bystander at a crime site, a cleaner. In fact, you will be rewarded for doing so by him not leading you into an ambush.
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* ''{{Futurama}}'' "The Deep South", the ship is sinking and taking on water. Fry rushes offscreen and we hear a toilet flush and the water starts to drain away.
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* ''{{Futurama}}'' "The Deep South", the ship is sinking and taking on water. Fry rushes offscreen and offscreen, we hear a toilet flush flush, and the water starts to drain away.
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Fry: "Did what?"
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Fry: [''reenters, zipping up pants''] "Did what?"
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** Also the basic frame of this trope is present in a joke in the (same) episode where Peter is blind. After Peter saves Horace from a burning building he is asked how he found the courage to risk his life inside said burning building, to which Peter responds "That freaking place was on fire!?"
to:
** Also the basic frame of this trope is present in a joke in the (same) episode where Peter is blind. After Peter saves Horace from a burning building he is asked how he found the courage to risk his life inside said burning building, to which Peter responds "That freaking place was on fire!?"fire?!"
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* In ''AvengersAcademy'' #25, Hazmat blasts X-27 with a toxic blast after X-27 stabs Mettle:
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* In ''AvengersAcademy'' #25, Hazmat blasts X-27 X-23 with a toxic blast after X-27 stabs Mettle:
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* In ''AvengersAcademy'' #25, Hazmat blasts X-27 with a toxic blast after X-27 stabs Mettle:
-->'''Giant-Man:''' Careful! Her healing factor isn't as strong as Wolverine's!
-->'''Mettle:''' You knew she'd survive that, right?
-->'''Hazmat:''' Yeah. Woulda done it anyway.
-->'''Giant-Man:''' Careful! Her healing factor isn't as strong as Wolverine's!
-->'''Mettle:''' You knew she'd survive that, right?
-->'''Hazmat:''' Yeah. Woulda done it anyway.
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* ''NakedGun'' 2 1/2: Frank Drebin is being "honored for his 1000th drug-dealer killed." He responds: "Thank you. But, in all honesty, the last two I backed over with my car. Luckily, they turned out to be drug-dealers."
to:
* ''NakedGun'' ''Film/TheNakedGun 2 1/2: 1/2'': Frank Drebin is being "honored for his 1000th drug-dealer killed." He responds: "Thank you. But, in all honesty, the last two I backed over with my car. Luckily, they turned out to be drug-dealers."
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** A BadBoss example is in "Band Candy". Mr Trick accuses a worker of sampling the cursed product and {{Neck Snap}}s him. Ethan Rayne asks Trick how he knew the worker was stealing. Trick replies that he didn't "[[MakeAnExampleOfHim And now no-one else will either]]."
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** A BadBoss example is in "Band Candy". Mr Trick accuses a worker of sampling the cursed product and {{Neck Snap}}s him. Ethan Rayne asks Trick how he knew the worker was stealing. Trick replies that he didn't "[[MakeAnExampleOfHim "[[MakeAnExampleOfThem And now no-one else will either]]."
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** The episode 'Ted' was based on the same thing. Somehow, Buffy's Angst at losing her temper and killing a human was completely forgotten once she found out that Ted wasn't human.
*** Not really an example, as she completely snapped after he attacked her, and the killing was an accident.
*** Not really an example, as she completely snapped after he attacked her, and the killing was an accident.
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** The episode 'Ted' A BadBoss example is in "Band Candy". Mr Trick accuses a worker of sampling the cursed product and {{Neck Snap}}s him. Ethan Rayne asks Trick how he knew the worker was based on the same thing. Somehow, Buffy's Angst at losing her temper and killing a human was completely forgotten once she found out stealing. Trick replies that Ted wasn't human.
*** Not really an example, as she completely snapped afterhe attacked her, and the killing was an accident.didn't "[[MakeAnExampleOfHim And now no-one else will either]]."
*** Not really an example, as she completely snapped after
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* ''KaizokuSentaiGokaiger", "The Amazing Silver Man" The crew accidentally stumbles upon an Action Commander planting a bomb to blow up the city and demands to know how they knew his plans. They didn't, [[YouJustToldMe he just told them.]]
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* ''KaizokuSentaiGokaiger", ''Series/KaizokuSentaiGokaiger", "The Amazing Silver Man" The crew accidentally stumbles upon an Action Commander planting a bomb to blow up the city and demands to know how they knew his plans. They didn't, [[YouJustToldMe he just told them.]]
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-->-- '''TheSimpsons''', ''Dial Z For Zombie''
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-->-- '''TheSimpsons''', '''WesternAnimation/TheSimpsons''', ''Dial Z For Zombie''
Changed line(s) 157 (click to see context) from:
* In ''AmericanDad''
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* In ''AmericanDad''''WesternAnimation/AmericanDad''
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However it can also be used to show the hero's courage, as in: "How did you know that bomb wasn't real?" "I didn't."
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However it can also be used to show the hero's courage, as in: "How did you know that bomb wasn't real?" "I didn't."
" (It's also used as a punchline, where the hero retroactively freaks out when they realise how much danger they were in.)
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Changed line(s) 102 (click to see context) from:
* Partially subverted in ''Series/{{Farscape}}'', where in an EnemyMine situation where they're all hostages, Rygel arranges that Scorpius (who wears a [[DeadManSwitch synchronization device with Crichton]] be shot then declares he wants a macabre souvenir to approaches him. When Scorpius asks him how he knew he was wearing armor, Rygel answers that he only suspected it, but didn't actually care ''that'' much if not.]]
to:
* Partially subverted in ''Series/{{Farscape}}'', where in an EnemyMine situation where they're all hostages, Rygel arranges that for Scorpius (who wears a [[DeadManSwitch synchronization device with Crichton]] to be shot then by one of the criminals. Then, just as he's about to be dragged off to the getaway vehicle, Rygel declares he wants a macabre souvenir to souvenir, and approaches him. When the "corpse." Once he's sure nobody's listening, he apologises... and Scorpius asks him how he knew he was wearing armor, body armor; Rygel answers that he only suspected it, but didn't actually care ''that'' much if not.]]he was right or wrong.
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Changed line(s) 163 (click to see context) from:
* In Part Two of the pilot for ''MyLittlePonyFriendshipIsMagic'', the main characters are attacked by a manticore. They fight back until [[FriendToAllLivingThings Fluttershy]] calls for them to stop, much to their surprise. She approaches the monster, nuzzles it, and the manticore reveals the source of its fury: a thorn in its paw. After she removes the thorn, the manticore lets them pass. Twilight Sparkle asks how Fluttershy knew about the thorn, and the pegasus replies that she didn't, but assumed the manticore just needed to be shown kindness.
to:
* In Part Two of the pilot for ''MyLittlePonyFriendshipIsMagic'', ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', the main characters are attacked by a manticore. They fight back until [[FriendToAllLivingThings Fluttershy]] calls for them to stop, much to their surprise. She approaches the monster, nuzzles it, and the manticore reveals the source of its fury: a thorn in its paw. After she removes the thorn, the manticore lets them pass. Twilight Sparkle asks how Fluttershy knew about the thorn, and the pegasus replies that she didn't, but assumed the manticore just needed to be shown kindness.
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* ''KaizokuSentaiGokaiger", "The Amazing Silver Man" The crew accidentally stumbles upon an Action Commander planting a bomb to blow up the city and demands to know how they knew his plans. They didn't, [[YouJustToldMe he just told them.]]
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* ''TheConspirator'': Aiken mistakingly asks a question at trail without knowing the answer. It was dumb luck that it worked in his favor, and he confesses this to his friends.
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-->'''Fred:''' ''I didn't. Thats why I step up traps all over this place!''
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-->'''Fred:''' ''I didn't. Thats That's why I step set up traps all over this place!''
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** This really surprised Clay and Rai though because up until that point, Omi knew ahead of time every trick thrown at him throughout the episode, including Rai [[RunningGag constant attempts through Shen-Gong-Wu battles and card dealings]]. When he said that he "guessed" that time, they were aghast he didn't/couldn't use his Tiger Instinct.
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* Variant in the ''Series/DoctorWho'' episode 'Amy's Choice'. [[spoiler: The Doctor, Amy and Rory are trapped between two dream worlds, and have to work out which is the dream and which is reality. The way they escape from the trap is to die in the dream world, and obviously, if they get it wrong, they die for real. Then, in one of the dream worlds, Rory dies. Amy then decides that she doesn't care if this is the dream world or not, and crashes the camper van into a house, killing herself. They all wake up in reality, and Rory asks Amy how she knew the world he died in was the dream world. The answer? [[CrowningMomentofHeartwarming "I didn't."]] ]]
to:
* Variant in the ''Series/DoctorWho'' episode 'Amy's Choice'."Amy's Choice". [[spoiler: The Doctor, Amy and Rory are trapped between two dream worlds, and have to work out which is the dream and which is reality. The way they escape from the trap is to die in the dream world, and obviously, if they get it wrong, they die for real. Then, in one of the dream worlds, Rory dies. Amy then decides that she doesn't care if this is the dream world or not, and crashes the camper van into a house, killing herself. They all wake up in reality, and Rory asks Amy how she knew the world he died in was the dream world. The answer? [[CrowningMomentofHeartwarming "I didn't."]] ]]
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Not to be confused with YouJustToldMe, although the same phrase can be used for that purpose too. See also IHaveNoIdeaWhatImDoing.
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Not to be confused with YouJustToldMe, although the same phrase can be used for that purpose too. Also not to be confused with AccidentalTruth. See also IHaveNoIdeaWhatImDoing.
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** Also the basic frame of this trope is present in a joke in the episode where Peter is blind. After Peter saves Horace from a burning building he is asked how he found the courage to risk his life inside said burning building, to which Peter responds "That freaking place was on fire!?"
to:
** Also the basic frame of this trope is present in a joke in the (same) episode where Peter is blind. After Peter saves Horace from a burning building he is asked how he found the courage to risk his life inside said burning building, to which Peter responds "That freaking place was on fire!?"
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** Reed based his decision on 'well I can't believe Doom solved that external power supply problem for that type of force field so Namor and Black Panther must be androids holding the power suppplies'. He was so certain Doom couldn't have solved a problem he couldn't even from decades into the future that he was willing to risk killing what was possibly the real Namor to prove himself right.
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* ''Film/MenInBlack II'': [[LaserGuidedAmnesia Amnesiac]] Agent K shoots alien pawn-shop clerk Jeeves in the head. [[RunningGag Again.]]
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* ''Film/MenInBlack II'': [[LaserGuidedAmnesia Amnesiac]] Agent K shoots alien pawn-shop clerk Jeeves Jeebs in the head. [[RunningGag Again.]]
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Changed line(s) 114 (click to see context) from:
* A similar example in ''DeusEx''. If you kill a [[spoiler: doorkeeper at the gates of the cemetery housing Dowd's crypt]] on sight, the guy will later turn out to be a spy, and [[spoiler: Dowd]] will even praise you for being just the right type of trigger-happy paranoiac they need.
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* A similar example in ''DeusEx''.''VideoGame/DeusEx''. If you kill a [[spoiler: doorkeeper at the gates of the cemetery housing Dowd's crypt]] on sight, the guy will later turn out to be a spy, and [[spoiler: Dowd]] will even praise you for being just the right type of trigger-happy paranoiac they need.
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* In issue #1 of the original ''TheNewWarriors'', Night Thrasher drops Richard Rider off a rooftop in order to re-activate his Nova powers (which Richard thought he'd lost after returning to Earth... long story). You can guess what Nova's next question and Night Thrasher's response are.
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Borders on IndyPloy for charging in with no other plan and MoralDissonance when you realized that our hero had no problem killing someone and just happened to land on the accepted side of WhatMeasureIsANonHuman.
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Borders on IndyPloy for charging in with no other plan and MoralDissonance when you realized that our hero had no problem killing someone and just happened to land on the accepted side of WhatMeasureIsANonHuman.
WhatMeasureIsANonHuman. Alternatively, sometimes the hero might have known the truth all along and just be yanking the chain of the person asking the question.
Changed line(s) 29 (click to see context) from:
* In an OVA from the first series of FullmetalAlchemist, Ed and Al get caught up with the Homunculi after Envy shapeshifts pretend to be a captured Winry. They escape, chaos ensues, and Edward ends up taking out Envy who's disguised as Roy Mustang.
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* In an OVA from the first series of FullmetalAlchemist, ''FullmetalAlchemist'', Ed and Al get caught up with the Homunculi after Envy shapeshifts pretend to be a captured Winry. They escape, chaos ensues, and Edward ends up taking out Envy who's disguised as Roy Mustang.
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* {{Wolverine}} Vol 3 #62, Wolverine and Mystique are tied up in front a Mexican firing squad. They escape.
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* {{Wolverine}} ''{{Wolverine}}'' Vol 3 #62, Wolverine and Mystique are tied up in front a Mexican firing squad. They escape.
Changed line(s) 131 (click to see context) from:
* [[http://www.explosm.net/comics/2481/ This]] CyanideAndHappiness comic.
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* [[http://www.explosm.net/comics/2481/ This]] CyanideAndHappiness ''CyanideAndHappiness'' comic.
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* (Dis)honorable mention to Vaarsuvius from ''TheOrderOfTheStick'', who killed [[SmugSnake Daimyo Kubota]] without an afterthought due to some GenreSavvy assumptions without actually knowing petty details like Kubota's crimes or even his ''name''.
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* (Dis)honorable mention to Vaarsuvius from ''TheOrderOfTheStick'', ''Webcomic/OrderOfTheStick'', who killed [[SmugSnake Daimyo Kubota]] without an afterthought due to some GenreSavvy assumptions without actually knowing petty details like Kubota's crimes or even his ''name''.
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* Partially subverted in ''{{Farscape}}'', where in an EnemyMine situation where they're all hostages, Rygel arranges that Scorpius (who wears a [[DeadManSwitch synchronization device with Crichton]] be shot then declares he wants a macabre souvenir to approaches him. When Scorpius asks him how he knew he was wearing armor, Rygel answers that he only suspected it, but didn't actually care ''that'' much if not.]]
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* Partially subverted in ''{{Farscape}}'', ''Series/{{Farscape}}'', where in an EnemyMine situation where they're all hostages, Rygel arranges that Scorpius (who wears a [[DeadManSwitch synchronization device with Crichton]] be shot then declares he wants a macabre souvenir to approaches him. When Scorpius asks him how he knew he was wearing armor, Rygel answers that he only suspected it, but didn't actually care ''that'' much if not.]]
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swapping ptitle and redirect
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[[redirect:{{ptitlesgukvqlk}}]]
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'''Homer:''' He was a zombie?
-->-- '''TheSimpsons''', ''Dial Z For Zombie''
StockPhrase uttered in which our hero attacks a seemingly InnocentBystander but discovers that the bystander was not what he appeared.
Goes as follows:
-->'''Sidekick:''' How did you know he/she was an evil X?
-->'''Hero:''' I didn't...
Let that sink in awhile.
Borders on IndyPloy for charging in with no other plan and MoralDissonance when you realized that our hero had no problem killing someone and just happened to land on the accepted side of WhatMeasureIsANonHuman.
However it can also be used to show the hero's courage, as in: "How did you know that bomb wasn't real?" "I didn't."
Not to be confused with YouJustToldMe, although the same phrase can be used for that purpose too. See also IHaveNoIdeaWhatImDoing.
----
!!Examples:
[[foldercontrol]]
[[folder:{{Anime}} and {{Manga}}]]
* An extreme example occurred in ''{{Saiyuki}}'' when the entire group sans Gojyo decided that the next time they saw Gojyo, they'd beat the crap out of him for leaving their group and throwing off the dynamic. They meet an evil doppelganger Gojyo and naturally start to beat the crap out of it. When they discover it isn't Gojyo they decided to pretend it is and proceed to tear it to shreds as a catharsis.
** Especially funny because the guy disguised as Gojyo fully expected them to pull the "How can I bring myself to fight my friend?" act... [[GoodIsNotNice Ehehe.]]
* This speech follows pretty much every victory of ''IrresponsibleCaptainTylor''. It comes to the point where his second in command begins to anticipate the 'I didn't' reply. He becomes GenreSavvy enough that he decides to imitate Tylors style when mounting his rescue operation. And yes, it also works when he does it.
* On ''YuYuHakusho'' Yusuke is faced with a SpotTheImposter predicament and is told he has to punch the culprit as hard as he can to expose him. He correctly chooses Kuwabara but only did so because he knows Kuwabara is used to being hit by him while ruling out the others. He did mention before doing so that he hoped he was right.
* In an OVA from the first series of FullmetalAlchemist, Ed and Al get caught up with the Homunculi after Envy shapeshifts pretend to be a captured Winry. They escape, chaos ensues, and Edward ends up taking out Envy who's disguised as Roy Mustang.
--> '''Al''': Oh wow, Ed, how did you know that wasn't the Colonel?
--> '''Ed''': ... it wasn't?
[[/folder]]
[[folder:ComicBooks]]
* ''Comicbook/TheAvengers'' #1½: TheHulk is attacking a Dr. Doom robot and is asked (after he smashes it) how he knew it's [[ActuallyADoombot a robot]]. "Robot?"
* ''{{Birds of Prey}}'' #97: Cheetah tackles BlackCanary and threatens to rip her throat out. Huntress shoots Cheetah in the shoulder, face and throat.
-->'''Black Canary:''' "Hey, how'd you know about Cheetah's healing factor?"\\
'''Huntress:''' "Healing what now?"
* In Marvel's ''GIJoe'' comic, Sgt. Slaughter is confronted by two Gung-Hos. He punches one in the face who turns out to be the shapeshifter Zartan. When asked how he knew which one to punch, Slaughter replies, "Lucky guess."
* A variant occurred in the comic book ''{{Spyboy}}''.
* An issue of ''FantasticFour'' had a future version of Namor and Black Panther coming to the present for some reason or another. It's revealed that Reed's devotion to his work would eventually drive his family away from him, culminating in Susan running off with Namor (as she's been on the verge of doing before). Reed takes this news calmly, then shoots Namor in the head. In this case, he suspected, but did not know for certain, that this was a plot orchestrated by Doom, and that the future Namor and Black Panther were robot impostors.
* ''TheMaxx'': the BigBad takes what is assumed to be a girl hostage. Maxx smashes the girl's face into a car, leaving the villain to wander off in a fit of anger. It was a CPR dummy, but Maxx very poorly tries to cover up his surprise it wasn't a real person.
* ''{{Runaways}}'' Volume 3 #10, Chase tells Victor to swallow the mutant cobra eggs in order to destroy the mother. Chase admits that he didn't know that it would work but figured worse case scenario they could rebuild Victor.
** A more serious example occurs in the first volume: after a vampire ([[spoiler: Topher]]) had taken out nearly the whole team, Karolina offered to let him bite her in exchange for letting Molly live, claiming she wanted to die. He bit her--and spontaneously combusted, since she's a solar-powered alien. When Alex asked her how she knew that would happen, she admitted that she had actually been trying to commit suicide by proxy.
* ''TheUmbrellaAcademy'': Dallas #1 features the Lincoln memorial statue come to life and terrorize the District of Columbia. To stop it Rumor says "Mr. President. I heard a rumor you were assassinated." This conjures up a statue of John Wilkes Booth who shoots the rampaging Lincoln. Hargreeves arrives on the scene and ask how she knew that would work. She replied "I didn't."
* From ''ComicBook/FallenAngel'': This exchange after Lee drops Shadow Boxer off a roof and he lands in a hay truck.
-->'''Slate''': Pretty impressive, by the way. Timing Boxer's falling into that truck so he wouldn't be hurt.
-->'''Lee''': ''{{beat|Panel}}''. What truck?
* {{Wolverine}} Vol 3 #62, Wolverine and Mystique are tied up in front a Mexican firing squad. They escape.
--> '''Mystique:''' ''How'd you know I'd be able to untie myself before the shooting started?''
--> '''Wolverine:''' ''I didn't.''
* In ''[[ComicBook/TheAvengers The New Avengers]]'', Dum-Dum Dugan shoots Victor Creed in the head:
-->'''Victor:''' So... They told you about my [[HealingFactor healin' factor]].
-->'''Dum-Dum:''' He heals?
[[/folder]]
[[folder:{{Film}}]]
* ''Film/MenInBlack II'': [[LaserGuidedAmnesia Amnesiac]] Agent K shoots alien pawn-shop clerk Jeeves in the head. [[RunningGag Again.]]
-->'''J:''' "You're back." \\
'''K:''' "No."\\
'''J:''' "How'd you know his head grows back?"\\
'''K:''' "It grows back?"
* ''NakedGun'' 2 1/2: Frank Drebin is being "honored for his 1000th drug-dealer killed." He responds: "Thank you. But, in all honesty, the last two I backed over with my car. Luckily, they turned out to be drug-dealers."
* ''GetSmart'': Max is asked [[spoiler: where the bomb is at the concert. He says that it is under the piano. Naturally, that's where it was. The chief asks how Max knew. The answer: Lucky guess.]]
* ''{{Papillon}}'' (1973) takes shelter in a leper colony after his escape, and is invited to share a cigar by their leader. Despite his fear of catching the disease, Papillon does so. There's a moment of silence from the leader (who clearly expected him to refuse) before he asks how Papillon knew he had dry leprosy, which isn't contagious. When Papillon replies that he didn't know, it breaks the ice between the two men.
* In the movie version (but not book) of ''TheHuntForRedOctober'', Jack Ryan and Captain Mancuso invoke this trope, in regards to which way Captain Ramius would turn for the next "Crazy Ivan" maneuver.
* ''{{MacGruber}}'':
--> '''Piper''': "How did you know I was wearing a bulletproof vest?!"
--> '''MacGruber''': "You were wearing a bulletproof vest? Awesome!"
** An interesting spin on this trope is that it was the final straw for Piper and he temporarily quits the team.
* In ''TheDayOfTheJackal'', Commissioner [=LeBel=] believes that a member of the French Cabinet is leaking confidential information to The Jackal. [=LeBel=] plays a tape of a telephone conversation to the entire Cabinet, showing that one of their members had been betraying them. Another Cabinet minister asks him how he knew which one of their phones to tap. "I didn't so I tapped all of them." Only the Prime Minister is unsurprised, since he gave [=LeBel=] unlimited authority in the first place.
* The question is reversed in ''{{Splice}}'' when [[spoiler: Elsa asks Clive if he knew that Dren had water lungs the whole time. He lies and says yes when he was actually trying to drown her.]]
* ''KeepingMum'', after Gloria and her daughter Holly learn in short order that the new housekeeper is a paroled murder who killed again, and is also Gloria's long-lost mother.
-->'''Gloria''': Aren't we forgetting the small matter of dead bodies?\\
'''Rosemary''': How did you know about the other bodies?\\
'''Gloria''': What other bodies?\\
'''Rosemary''': *relieved* Oh, you didn't know about the other bodies.
* ''DiamondsAreForever'' has an example of one of the mooks doing this. The mook throws Plenty O'Toole, one of the Bond girls, off of a high floor, and she lands unharmed in a swimming pool below. When Bond compliments him on his aim, the mook replies, "I didn't know there was a pool down there."
* Zigzagged in ''PiratesOfTheCaribbean: OnStrangerTides''. Blackbeard forces Jack to play a variant of RussianRoulette with four unloaded pistols and two loaded ones, and Angelica (his daughter, Jack's love interest) as the target. When Jack takes the option to jump instead, Angelica asks her father if he knew which guns were loaded. He says he did, but considering his later actions there's no reason to believe he would care about putting his daughter in danger.
* Used on the {{Rifftrax}} for the opening of ''TheDarkKnight''.
--> '''Mike:''' (imitating the bank manager with a rifle) ''What ?! He was robbing my bank! I thought he was just a clown!''
[[/folder]]
[[folder:LiveActionTV]]
* ''NedsDeclassifiedSchoolSurvivalGuide'' has Cookie as the "new kid" posing as a British person to seem more interesting to his new class. Turns out the class already has a British kid, who calls him out on it. Cue Cookie stammering and then trying to save face by sputtering miscellaneous stereotypical and nonsensical Britishisms. Then it turns out he was [[FakeBrit faking]] as well; he's from Ohio, not Britain. Cookie asks "Then how did you know I wasn't British?". The response? "I didn't. I just took a stab and you ''caved''.
* The MadeForTVMovie ''NickFury, Agent of SHIELD'' (with DavidHasselhoff as Nick Fury). Nick shoots Director Princer, who turns out to be a Evil Life Model Decoy, but Nick didn't know this. He just hated Princer.
* In the ''BuffyTheVampireSlayer'' tie-in comic "Ring of Fire", Kendra attacks a man who turns out to be a demon. Xander asks how she knew. She didn't.
** The episode 'Ted' was based on the same thing. Somehow, Buffy's Angst at losing her temper and killing a human was completely forgotten once she found out that Ted wasn't human.
*** Not really an example, as she completely snapped after he attacked her, and the killing was an accident.
* In an episode of ''{{Angel}}'', Wesley shoots somebody who turns out to be a robot double, to dramatic rather than comedic effect. The point in that case was not that Wesley makes a habit of casually killing people, but that in this one instance he was pushed over a line he wouldn't normally cross. [[spoiler: It was a robot duplicate of his ''father'', by the way...]]
** Knowing how he treated him as a child, the shooting is 100% justified. However, Wesley does shoot one other person in S5, in the leg, in anger. It seems that getting Wes angry when he has a gun nearby is a VERY bad idea.
* There was a variation in ''{{Spooks}}'' once (season 2 episode "I Spy Apocalypse"), where the guy the hero shot was real (and human), but the gun turns out to have been rigged.
* ''DeepSpaceNine''. When Worf realises General Martok is suffering from post-traumatic stress disorder as a result of his imprisonment, he [[ChallengingTheChief challenges Martok's leadership in the Klingon tradition]], then lets him win the subsequent knife fight. Reinvigorated, Martok rallies to his command and saves the day. Later, knowing that Worf lowered his guard deliberately, Martok asks how Worf knew he wouldn't kill him. Worf replies simply, "I didn't". The general is so impressed he officially adopts Worf as a member of his House.
* In the ''WhiteCollar'' season one finale, Peter shoots [[spoiler: Fowler]] in the chest to stop him from shooting [[spoiler: Diana]]. When [[spoiler: Diana]] asks how he knew [[spoiler: Fowler]] was wearing a vest, he responds with this.
** The MoralDissonance is averted, however; the "victim" in this case? [[spoiler:CorruptCop SmugSnake Fowler, who's pulled [[MoralEventHorizon more than enough crap]] to qualify for a bullet]].
* Variant in the ''Series/DoctorWho'' episode 'Amy's Choice'. [[spoiler: The Doctor, Amy and Rory are trapped between two dream worlds, and have to work out which is the dream and which is reality. The way they escape from the trap is to die in the dream world, and obviously, if they get it wrong, they die for real. Then, in one of the dream worlds, Rory dies. Amy then decides that she doesn't care if this is the dream world or not, and crashes the camper van into a house, killing herself. They all wake up in reality, and Rory asks Amy how she knew the world he died in was the dream world. The answer? [[CrowningMomentofHeartwarming "I didn't."]] ]]
* A variant in ''{{Bugs}}'' happens when the team's weapons expert is wired with a bomb to force him to act as a sniper to remove someone for the BigBad. While the tech specialist is trying to disarm it the BigBad realises he's not going to make the shot and moves to kill the target himself. The weapons expert pulls away from the tech and kills the BigBad, then the tech removes a chip from the bomb and it deactivates. Cue the tech being lambasted for taking so long and replying that she just removed anything, choosing probably being blown to bits over certainly being.
* In one episode of season nine of ''{{Smallville}}'', Oliver Queen is standing on a podium which has been rigged to blow when he steps off. Clark arrives towards the end of the episode, having learned that the bomb was [[spoiler: fake]] only to find that [[spoiler: Oliver has already stepped off the podium]]. How did he know? [[WhamLine He didn't]], and instead waited until the room was clear so that he could [[spoiler: attempt suicide]].
* Partially subverted in ''{{Farscape}}'', where in an EnemyMine situation where they're all hostages, Rygel arranges that Scorpius (who wears a [[DeadManSwitch synchronization device with Crichton]] be shot then declares he wants a macabre souvenir to approaches him. When Scorpius asks him how he knew he was wearing armor, Rygel answers that he only suspected it, but didn't actually care ''that'' much if not.]]
[[/folder]]
[[folder:Mythology]]
* This troper once read a story about a samurai who nobody would hire because his severe ill luck causes his side to always lose. In the end, when defending an underwater city from an evil dragon, the samurai spits three times on his third, and last, arrow for good luck, then shoots the rampaging dragon between the eyes, after which it promptly falls down stone dead. The king of the underwater city asks "How did you know human saliva is deadly poison to dragons and demons?" The hero immediately responds, "I didn't"
[[/folder]]
[[folder:NewspaperComics]]
* Alice in ''{{Dilbert}}'' deduces that a coworker must either be an unhelpful moron or a robot send to destroy the company from within, and proceeds to tear his (robotic) head off. Dilbert asks how she knew it was the robot-option...
[[/folder]]
[[folder:VideoGames]]
* The player gets an opportunity to have his own How Did You Know? moment in the (chronological) beginning of ''MaxPayne 2''. No game mechanic prevents you from killing an innocent bystander at a crime site, a cleaner. In fact, you will be rewarded for doing so by him not leading you into an ambush.
** Max himself gets one when he [[spoiler:shoots his partner when she confronts him and his fugitive love interest.]] Only later does he actually find any evidence that [[spoiler:she was going to kill them both by order of the big bad.]] Max, ever the melodramatic sort, states that thinking for even a moment that the future revelation justified his prior actions damns him just that much more.
* A similar example in ''DeusEx''. If you kill a [[spoiler: doorkeeper at the gates of the cemetery housing Dowd's crypt]] on sight, the guy will later turn out to be a spy, and [[spoiler: Dowd]] will even praise you for being just the right type of trigger-happy paranoiac they need.
* ''AssassinsCreed'' had Al Mualim and Altair using almost these exact words during one of their discussions. Al Mualim asking and Altair answering.
* The popular gamemode for the ''HalfLife 2'' mod ''GarrysMod'' titled "TroubleInTerroristTown" revolves around trust/mistrust in a town full of terrorists, 1 in 5 of which are united traitors, seeking to kill the innocent terrorists, similar to the Mafia game people play on forums/IRC/at social gatherings. Occasionally someone gets shot for no real reason, or are accidentally pushed off a high ledge or get just plain unlucky and die suddenly when they're a traitor. The result is an upset traitor, and a confused, but happy group of innocent terrorists who have one less threat to deal with. Especially funny when playing with friends who you actually know, rather than random players.
[[/folder]]
[[folder:{{Webcomics}}]]
* [[http://www.egscomics.com/?date=2003-06-27 Set up here]] in ''ElGoonishShive'' (the full exchange doesn't come until the next strip):
-->'''Mom:''' You've brought ''boys'' over, Susan?\\
'''Susan:''' No, Mother, just this one. The other two are girls; they're checking out our TV.\\
'''Justin:''' Hi.\\
'''Mom:''' I'm not comfortable with him spending the night here, Susan.\\
'''Susan:''' Don't worry, Mother. He's ... gay. He's gay, so he won't try anything with me.\\
'''Mom:''' Ugh... men who like men... [[DoesNotLikeMen pure insanity]]. Fine, he can stay. Maybe his homosexuality will rub off on you, and you'll find yourself a decent woman. I'll leave the lot of you alone now... I'll be upstairs.\\
'''Susan''' (thinking): Hehe... she bought it...\\
'''Justin''': So... how'd ''you'' know that I'm gay?
* (Dis)honorable mention to Vaarsuvius from ''TheOrderOfTheStick'', who killed [[SmugSnake Daimyo Kubota]] without an afterthought due to some GenreSavvy assumptions without actually knowing petty details like Kubota's crimes or even his ''name''.
** A comical version done [[http://www.giantitp.com/comics/oots0259.html here]].
* ''[[http://zudacomics.com/the_night_owls Night Owls]]'' #134, Ernie asks Bill how he knew Louie's magical gaspipe was inert. Bill doesn't know what he's talking about.
* [[http://www.explosm.net/comics/2481/ This]] CyanideAndHappiness comic.
[[/folder]]
[[folder:WesternAnimation]]
* In a ''WesternAnimation/XiaolinShowdown'' episode where Kimiko is fighting an [[RobotMe evil robot duplicate]], Omi jumps high in the air and takes one of the Kimikos out in one swipe. The defeated robot explodes, but, when asked about how he knew which one was which, Omi admits to having guessed. Not quite as extreme as the page description otherwise implies, since if he'd kicked the real Kimiko, she'd have probably just rubbed her kicked spot and been annoyed... not actually exploded.
* ''TheSimpsons'' Halloween episode "Dial 'Z' for Zombie", Homer shoots the zombie Flanders.
-->'''Bart:''' Dad! You killed the zombie Flanders!\\
'''Homer:''' He was a zombie?
** Another example from another Halloween episode:
-->'''Grampa:''' ''(holding a hammer and stake)'' "Quick! We must kill the boy!"\\
'''Marge:''' "How do you know he's a vampire?"\\
'''Grampa:''' "He's a vampire!?" ''(runs off screaming)''
* ''{{Futurama}}'' "The Deep South", the ship is sinking and taking on water. Fry rushes offscreen and we hear a toilet flush and the water starts to drain away.
--> Leela: "Fry, you did it!"\\
Fry: "Did what?"
* ''MegasXLR'': "The Driver's Seat" Coop accidentally teleports his Mega-Slush into a critical component of the Glorft mothership.
--> Commander: ''"How did they know exactly where to hit us?!"''
* ''RobotChicken'': In the ''YellowSubmarine'' [[XMeetsY meets]] ''TheHuntForRedOctober'' [[http://video.adultswim.com/robot-chicken/ping-them-back.html sketch]], Ringo didn't know the hole would stop the missile from hitting the Blue October; he was still on acid and said whatever came to him.
* The ''WesternAnimation/WingCommanderAcademy'' cartoon had an example where, faced with a Kilrathi carrier, the commander decides to play chicken with it. This works, and the carrier retreats.
--> Recruit: "How did you know that they would retreat before we rammed them?"
--> Commander: "I didn't."
* In ''AmericanDad''
-->'''Roger:''' How did you know I was fireproof? Even I didn't know that! Wait, did you know? I'm going to assume "yes" to preserve the friendship.
** Again in "When a Stan Loves a Woman." At the shooting range, he and a mysterious woman simultaneously shoot each other. Cut to a restaurant:
-->'''Stan:''' So how did you know I was wearing a vest?
-->'''Woman:''' I didn't, but I have a rowboat, so it's easy for me to dump stuff. Did you know about mine?
-->'''Stan:''' No, I was composing your suicide note when you stood back up!
* In Part Two of the pilot for ''MyLittlePonyFriendshipIsMagic'', the main characters are attacked by a manticore. They fight back until [[FriendToAllLivingThings Fluttershy]] calls for them to stop, much to their surprise. She approaches the monster, nuzzles it, and the manticore reveals the source of its fury: a thorn in its paw. After she removes the thorn, the manticore lets them pass. Twilight Sparkle asks how Fluttershy knew about the thorn, and the pegasus replies that she didn't, but assumed the manticore just needed to be shown kindness.
* This exchange from ''FamilyGuy'' after [[LovableSexManiac Glenn Quagmire]] saves a woman who is having a heart attack while changing at the mall:
-->'''Woman 1:''' That was amazing!
-->'''Woman 2:''' You saved her life!
-->'''Woman 3:''' Thank God you know CPR!
-->'''Quagmire (confused look):''' What the hell is CPR?
** Also the basic frame of this trope is present in a joke in the episode where Peter is blind. After Peter saves Horace from a burning building he is asked how he found the courage to risk his life inside said burning building, to which Peter responds "That freaking place was on fire!?"
* ''ScoobyDooMysteryIncorporated'' "The Dragon's Heart"
-->'''Mr. Blake:''' ''But how did you know she would step in the middle of the boat?''
-->'''Fred:''' ''I didn't. Thats why I step up traps all over this place!''
* In ''{{Archer}}'':
-->'''Archer:''' ''(calls Ray on his cellphone, then snaps a picture of a bomb in his mother's work desk)'' I need you to help me...\\
'''Ray:''' ''(instantly)'' Blue and yellow.\\
'''Archer:''' You mind looking at that for more than a half-second?\\
'''Ray:''' I wired the damn thing. Ass.\\
'''Archer:''' Well, I didn't know that. Ass. ''(clips wires)''\\
'''Ray:''' Holy shit, you actually did it? I was lying.
[[/folder]]
[[folder:RealLife]]
* In the Soviet Union in 1983, a Soviet early warning nuclear missile detection system gave a false alarm that a US nuclear missile was headed for the Soviet Union. The officer in charge at the time decided it was a false alarm and chose not to report it to his superiors, deviating from standard procedure and possibly averting WorldWarIII. Of course it was a false alarm caused by a mechanical error, but how did he know? [[spoiler:Because only one (and then a moment later, three) missiles were detected and he assumed correctly that a real US attack would consist of hundreds of missiles.]]
[[/folder]]
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