Code Lyoko/Nightmare Fuel


 * XANA-possessed characters can be particularly creepy, and many examples of XANA trying to murder the protagonists (like electrocuting Jeremie) can induce nightmares.
 * XANA Jeremie's "NOT LOGICAL! NOT LOGICAL!" after the kids decide that he's the fake Jeremie because he doesn't understand that Jeremie would virtuatlize himself to save his friends.
 * Most ways that XANA tries to kill Jeremie can cause Nightmare Fuel. Jeremie gets electrocuted by one of the power sources for the supercomputer, as well as getting electrocuted by the Specters. Also, when he discovers that the one  is actually XANA in disguise, XANA gets pissed at him, possesses him, and proceeds to suffocate him while Ulrich can do nothing but watch.
 * "Ghost Channel" (the episode with the XANA Jeremie Logic Bomb), the scene where he screams and then tries to kill the characters.