* Fittingly, any time a character has a NightmareSequence, odds are it'll be pretty horrifying. [[spoiler: Especially those sent by Nightmare Moon.]]
* [[StrappedToAnOperatingTable Everything]] that [[MindRape Carrot experienced]] at Gustav's hands.
* The ColdBloodedTorture that Rarity experienced in captivity, as well as [[spoiler: Kili's vicious murder]], though the latter is more of a TearJerker.
* In ''Flutterhulk'', the fact that Fluttershy has [[AlternateIdentityAmnesia no memory of anything]] her [[ComicBook/TheIncredibleHulk giant rage monster of an alter-ego]] does is quite frightening. Especially when you see how wild and destructive Flutterhulk really is.