Moral Event Horizon / Web Animation

  • Your mileage may vary on this, but in The Fear Hole Professor Melancholly gets this in Episode 7 when he murders the adorable childlike Antagonizer in cold blood. What really sinks this past the horizon is that Antagonizer was telling Melancholly that he loved him.
  • The Most Popular Girls in School: Jenna Darabond crosses it right off the bat in Episode 31 when she reveals that she was the one who burnt down the Atchison mallóbecause she wanted Justin all to herself. In the eyes of fans, she also crosses it by hating Amberlynn Weggers.
  • RWBY:
    • Adam crosses this when he begins torturing Blake to provoke Yang, and then slices Yang's right arm off. Worse, when Blake gets between him and the now unconscious Yang, he tries to decapitate her.
    • Hard to say exactly when Cinder crossed this, but for most fans it would be unleashing level 9 Grimm invasion on Vale which came close to destroying the whole city.

http://tvtropes.org/pmwiki/pmwiki.php/MoralEventHorizon/WebAnimation