History MoralEventHorizon / DCVideoGames

** If ComicBook/PoisonIvy betraying her longtime friend Harley and joining the Society wasn't bad enough, but when she uses her pheromones to take control of Harley and nearly ''poisons'' her with said pheromones is when she really crosses it.

[[caption-width-right:350:[[WouldHurtAChild Now you have done it, Superman.]]]]

* Garfield "Firefly" Lynns crosses it when he [[HostageSituation holds a dozen people hostage on the Gotham Pioneer Bridge]] with the intention of luring both Batman and most of the GCPD there, so he can blow it up to kill everyone once they're all gathered. Even when Batman informs the masked arsonist that the bounty on his head has been called off, Firefly acknowledges it... but [[ForTheEvulz continues his attempted mass-murder regardless, purely out of sadistic joy]].

* We already knew how much of a deranged sadist Professor Pyg was, but his actions in the Gotham Story ''Dollotron'' firmly establish just how monstrous he can be. As part of a tour for his Circus Of Strange, Valentin [[WouldHurtAChild abducts a young boy and agonizingly turns him into a Dollotron through a series of brutal surgeries]], proudly [[KickTheDog showing off his handiwork to the boy's father]]. The traumatized man offers Pyg a significant sum of money to just have his son back, at which point Pyg shakes his head and [[PreMortemOneLiner utters the following ominous line]], before siccing a large group of other Dollotrons -- several of whom are noted to have previously been children and their parents -- on the man with the intention of [[TheAssimilator inflicting the same horrors upon him]].

* We already knew how much of a deranged sadist Professor Pyg was, but his actions in the Gotham Story ''Dollotron'' firmly establish just how monstrous he can be. As part of a tour for his Circus Of Strange, Valentin [[WouldHurtAChild abducts a young boy and agonizingly turns him into a Dollotron through a series of brutal surgeries]], proudly [[AndShowItToYou showing off his handiwork to the boy's father]]. The traumatized man offers Pyg a significant sum of money to have his son back, at which point Pyg shakes his head and [[PreMortemOneLiner utters the following ominous line]], before siccing a large group of other Dollotrons -- several of whom are noted to have previously been children and their parents -- on the man with the intention of [[TheAssimilator inflicting the same horrors upon him]].

* Even though he's an InsufferableGenius, ComicBook/TheRiddler's always been held up as one of Batman's lighter and less-sadistic villains. While he had put various security guards in elaborate death traps, at least there was always the chance of Batman being able to save them. That's why it's so genuinely shocking to see him put Cash and the other remaining guards in a death trap that will inevitably kill them, allowing him to watch them slowly walk and walk until they're too exhausted to continue and they meet their end. All while he taunts them for being too ignorant to escape on their own. If you look around the control room, you'll find a "scoreboard" that shows a few of them had already met their end before Batman came to the rescue.

* ComicBook/TheScarecrow already proves he isn't playing around when he threatens to douse the city in fear toxin, but the moment he [[KickTheDog forces Gordon to lure Batman to him, then throws Barbara off the construction building when Gordon seemingly kills Batman]] is the moment he truly crosses the line.
* An in-universe example; the act that made Jason Todd decide that the Joker was utterly irredeemable and had to die was when he blew up a school filled with kindergarteners and crudely stitched their body parts together, with the children's mothers fighting over their "patchwork corpses."
* ComicBook/HarleyQuinn was never the nicest girl in town, but her actions in ''A Matter of Family'' were horrific, even if she only was an accomplice. Just to recap: she helped ComicBook/TheJoker con the desperate rich father of a [[LittlestCancerPatient little girl with terminal cancer]] into building an amusement park for her just so the Joker and Harley could use it as their secret hideout once the father and daughter died; helped turn said little girl into a test subject for the TITAN formula with the promise that it would cure her (which also doubles as a MoralEventHorizon in retrospective for [[VideoGame/BatmanArkhamAsylum Dr. Young from the first game]]), but was what caused her painful death; [[DrivenToSuicide drove the grieving father into suicide]] by rubbing salt into the would AND gave him a drug that would supposedly kill him quickly and painlessly ''but was actually Joker serum'' that gave him a painful death between laughing fits.

** [[Characters/BatmanTheJoker The Joker]] crosses it big-time with the act that gave birth to the ''Injustice''-verse — namely, tricking Superman into killing his wife Lois and their unborn child by taking them up to space without a suit because he was under the effects of a Kryptonite-induced fear toxin that made Superman think she was Doomsday. To make things ''worse'', this triggers a DeadMansSwitch that Joker had placed in Lois, which would set off a nuke that Joker had planted in Metropolis, devastating the city and killing millions. And ''then'' he goes on to drive Superman to murder him, something that he was never able to do with his archenemy Batman, in what would prove to be the catalyst to this Superman's StartOfDarkness, sending him down the road to tyranny and evil in the name of preventing another such tragedy from ever happening again.

[[caption-width-right:350:[[WouldHurtAChild Now you have done it Superman]]]]

* ComicBook/RasAlGhul is definitely shown to be insane, when he threatens to kill [[ComicBook/TaliaAlGhul Talia]], his own daughter, to make Batman kill him and take his place.

** [[Characters/InjusticeSuperman Regime Superman]] crosses this line when he burns a hole right through the skull of Regime Shazam for daring to turn around on his word of a new world order. Granted, Supes had done a lot more prior as the high councilor of the [[Characters/InjusticeOneEarthRegime Regime]], but when he does that, on top of giving orders to destroy Gotham City and Metropolis (the very cities he had gone KnightTemplar in order to protect from another tragedy like the one that took Metropolis and launched his StartOfDarkness) to punish the people that are siding with the Insurgency, it provokes Regime Flash to pull a HeelFaceTurn. It is this action that establishes Regime Superman as an irredeemable tyrant that has truly crossed the line.
** [[Characters/BatmanTheJoker The Joker]] crosses it big-time with the act that gave birth to the Injustice Universe — namely, tricking Superman into killing his wife Lois and their unborn child by taking them up to space without a suit because he was under the effects of a Kryptonite-induced fear toxin that made Superman hallucinate that she was Doomsday. To make things ''worse'', this would activate a DeadMansSwitch that Joker had placed in Lois, which would set off a nuke that Joker had planted in Metropolis, devastating the city and killing millions. And ''then'' he goes on to drive Superman to murder him, something that he was never able to do with his archenemy Batman, in what would prove to be the catalyst to this Superman's StartOfDarkness, sending him down the road to tyranny and evil in the name of preventing another such tragedy from ever happening again.

** Sadly for Batman/Bruce, [[AdaptionalVillainy Thomas Wayne]] crossed it by deliberately subjecting Esther Cobblepot to a FateWorseThanDeath just to get her family's estate.

** Sadly for Batman/Bruce, Thomas Wayne crossed it by deliberately subjectingEsther Cobblepot to a FateWorseThanDeath just to get her family's estate.

** [[Characters/InjusticeJoker The Joker]] crosses it big-time with the act that gave birth to the Injustice Universe — namely, tricking Superman into killing his wife Lois and their unborn child by taking them up to space without a suit because he was under the effects of a Kryptonite-induced fear toxin that made Superman hallucinate that she was Doomsday. To make things ''worse'', this would activate a DeadMansSwitch that Joker had placed in Lois, which would set off a nuke that Joker had planted in Metropolis, devastating the city and killing millions. And ''then'' he goes on to drive Superman to murder him, something that he was never able to do with his archenemy Batman, in what would prove to be the catalyst to this Superman's StartOfDarkness, sending him down the road to tyranny and evil in the name of preventing another such tragedy from ever happening again.

** If Poison Ivy betraying her longtime friend Harley and joining the Society wasn't bad enough, but when she uses her pheromones to take control of Harley and nearly ''poisons'' her with said pheromones is when she really crosses it.

* Ra's al Ghul is definitely shown to be insane, when he threatens to kill Talia, his own daughter, to make Batman kill him and take his place.
* Even though he's an InsufferableGenius, the Riddler's always been held up as one of Batman's lighter and less-sadistic villains. While he had put various security guards in elaborate death traps, at least there was always the chance of Batman being able to save them. That's why it's so genuinely shocking to see him put Cash and the other remaining guards in a death trap that will inevitably kill them, allowing him to watch them slowly walk and walk until they're too exhausted to continue and they meet their end. All while he taunts them for being too ignorant to escape on their own. If you look around the control room, you'll find a "scoreboard" that shows a few of them had already met their end before Batman came to the rescue.

* Scarecrow already proves he isn't playing around when he threatens to douse the city in fear toxin, but the moment he [[KickTheDog forces Gordon to lure Batman to him, then throws Barbara off the construction building when Gordon seemingly kills Batman]] is the moment he truly crosses the line.

* ''VideoGame/LegoBatman'': Lex Luthor easily crosses it by trying to murder everybody in Wayne Tower, because Wayne snubbed him at the Man of the Year Awards.

** Penguin crosses it when shooting the innocent debate moderator. Even Bruce admits this event cemented that [[ThatManIsDead his best friend is gone]]. If that wasn't enough he tries to kill Harvey by smashing his face with a stage light as opposed to the quick death he gave Mayor Hill who actually deserved it.