Gankutsuou/Nightmare Fuel

• End of episode 15, the Count sends Albert back to Earth and then he cries, knowing what he had done to Albert. But when they show close-ups of his face, only half of it is sad, the other half is the evil Gankutsuou smile. Now that by itself is creepy, but when the Gankutsuou side takes over, the cries immediately transform into the freakiest evil laugh ever heard.
• Andrea Cavalcanti at first seems like an effortlessly charming Bishonen but is eventually revealed to be outright deranged to the point of seducing his mother and almost raping (or does he really?) his half sister and stabbing his father. And let's not forget Danglar's Death by Materialism, preceded by a good amount of madness...oh, and Fernand Mondego, who snaps to the point of shooting his wife and son. Or Héloise de Villefort and her masturbation scene and the whole thing with her poison ring...
• Everything that involves Gankutsuou. Albert's nightmares about the Count (especially after he kills Franz). The execution scene (especially in the manga... ohmygod). Edmond's imprisonment. Haydee's whole past. Your mentor and substitute father stalking you and trying to kill you. Your dad turning out to be a parvenu and an opportunistic betrayer and murderer, then trying to kill you along with your mom, then trying to kill a young girl whose father he already murdered. Your future husband trying to rape you and turning out to be both a criminal and your half-brother. Phew, Someone's having a bad day.
• Andrea at one point attacks Haydee with a crazy look on his face and looked like he was gonna try to rape her but the Count shows up and he stops.