Gargoyles/Nightmare Fuel


 * The Hotel Cabal episode, which ends with Mace Malone frantically trying to find an exit to the sealed maze of traps all of which are designed to drive the prisoner insane. Word of God is he eventually starved to death.
 * And Demona happily destroying human statues in "City of Stone" -- especially when she only destroyed the arms of one.
 * Jackal in "The Green" when he fantasizes about smashing stone Gargoyles by day. Frightening enough as it is, but then he whips out a chisel and carves Goliath's face to look like his.
 * The whole concept of Thailog, once you think about it. The guy has Goliath's strength, wordy knowledge, and combat skill coupled with the knowledge and manipulative genius of Xanatos and the scientific knowledge and goofiness of Sevarius, but without a trace of any kind of morality. Be afraid... be very afraid. Xanatos is afraid, you should be, too.