- Fittingly, any time a character has a Nightmare Sequence, odds are it'll be pretty horrifying. Especially those sent by Nightmare Moon.
- Everything that Carrot experienced at Gustav's hands.
- The Cold-Blooded Torture that Rarity experienced in captivity, as well as Kili's vicious murder, though the latter is more of a Tear Jerker.
- In Flutterhulk, the fact that Fluttershy has no memory of anything her giant rage monster of an alter-ego does is quite frightening. Especially when you see how wild and destructive Flutterhulk really is.
Nightmare Fuel / Harmony's Warriors