In a deleted scene from Season 6 Episode 6 - No Second Prances, Discord expresses his satisfaction with the way Twilight handled Starlight's friendship with Trixie.

Garble conquers the Gauntlet of Fire becomes the Dragon Lord. He then promptly goes ahead with his plan to invade Equestria. Bad idea.

This story is a sequel to Chasing Metaphors

Iridessa felt no guilt or remorse. She was entitled to take the body of this foolish pegasus who would dare disgrace her honor and shame her before her kind, and that was that.

If only she knew exactly who this pegasus was, and what entity she served. The Tree of Harmony knows what Iridessa did, and it is not happy.

After being reformed during the events of The Cutie Re-Mark, Starlight Glimmer was secretly called upon by Princess Celestia herself for an important task. Certain individuals from Our Town had adopted Starlight's philosophy and left to create a larger Equalist Party with nefarious plans for Equestria. So, for much longer than she desires, Starlight must now live as a member of the ruthless Equalist Party at the command of Princess Celestia. It is a long pair of even black roads through the darkness, on which Starlight must walk alone. Now completely spurned, scorned, and hated by Twilight Sparkle and her friends, Starlight must keep up her Equalist persona as she secretly infiltrates and foils the plans of the extreme Left-Wing Totilitarian Equalist Party.
(Story inspired by "I Was a Communist For the FBI")

Yet another nightmare brought on by the fear that she will never fly has led Scootaloo to go onto a midnight stroll. She didn't expect some strange force to guide her towards Princess Twilight's castle. She was a bit surprised when the front doors unlocked and swung open before her. But what Scootaloo could never have predicted was hearing the voice of the higher power that resides in the Tree of Harmony.

After returning from vacation, Diamond Tiara discovers that Silver Spoon has been missing for a week. Diamond suspects that the Cutie Mark Crusaders had something to do with it, especially when she notices how close Spike has become to the trio of fillies. Diamond Tiara is ignored by the older ponies, but as more evidence surfaces, it becomes clear that Diamond just might be on to something.

Sit back and relax as Applebloom takes you on a tour through the set of "Blooming Late", a masterpiece of a psychological thriller written by Akumokagetsu.
(Be mindful that "Blooming Late" is a Rated M story.)
This story is a parody of the trailer for Alfred Hitchcock's "Psycho."

This story is a sequel to The Very Sad Story of the Death of a Dragon Named Spike

Gather round and listen as Princess Luna relates to you the very sad story of the death of a filly named Diamond Tiara. Oh, not a physical death, that would be too good for Diamond Tiara. This is a different kind of death Luna is talking about. But you'll have to listen to the whole story in order to fully understand this very sad tale.
Based off of the Red Door ending from The Stanley Parable Half-Life 2 Mod.
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Ice Age Crossover

After a miss-hap involving Scrat and a Time Machine, Prancer from Ice Age: A Mammoth Christmas finds himself in Equestria. He's welcomed (And studied) by Princess Twilight Sparkle and her council of Friends, but he quickly finds a kindred spirit in Rainbow Dash. The flying reindeer and flying pegasus soon get really close. Prancer soon find himself being "helped along" the road to romance by Rarity, who believes he and Dashie are perfect for each other. Applejack, however, has a sour opinion on love and romance thanks to the Trenderhoof incident, and tries her hardest to get Dash disillusioned with the hot-shot reindeer. Who will win, Rarity or Applejack? And more importantly, do Prancer and Dashie belong together or not?

Required Watching: No Time For Nuts and Ice Age: A Mammoth Christmas

With Daring Do as his prisoner, Ahuizotl discovers the temple where Scorpan sealed away the Rainbow of Darkness. The Mane Six, joined by Celestia and Luna, quickly go to prevent such an evil force from being unleashed. However, it turns out their attempts to reseal the Rainbow of Darkness cause some unforeseen consequences. Only the Rainbow of Light can set things right, but where could it be? It turns out that its closer than they think.
(Takes place after Season 4. Elements of G1 are used. NOT a character turns evil story.)