* HilariousInHindsight: Twilight being groomed to be a successor for the princesses rings pretty closely to the ending of the third season of the series, [[spoiler: where she does get crowned a princess of Equestria and becomes an Alicorn. [[TearJerker Too bad Raefire wasn't around to see this happen.]]]]
* MoralEventHorizon:
** Literally ''everything'' Nightmare does is either this or a KickTheDog moment.
** Discord apparently crossed it in the backstory, when he killed Celestia and Luna's parents -- he {{Mind Rape}}d them so far past the DespairEventHorizon that they simply lost the will to live and wasted away.
* NeverLiveItDown: In a humorous moment shortly before everything goes to hell, Twilight is shown worrying that this will happen in regards to her breakdown in "Lesson Zero".
* {{Tearjerker}}: In real life, the author's untimely passing.
* TheWoobie: Several.
** Birostris Oswaft - being TheLastOfHisKind for ''ten thousand years'' [[{{Understatement}} definitely left a mark on him]], so much so that he asks Twilight to [[MercyKill kill him and put him out of his misery]].