A human is in Equestria as a Unicorn. Human becomes a film director and one of the most controversial figures in Equestrian entertainment.

In the aftermath of the war, there are Decepticons still on the loose. Optimus Prime chases Megatron to a primitive world called Equestria, where they and their respective crews do battle.

The Let's Player Dashie does a few episodes about an mlp virtual reality sim.

A young woman from Earth finds herself in one of those weird alternate universes of MLP where humans are villainous animals. She deals with it because adapting to the stupid is what humanity does best.

It was supposed to be a regular power fantasy. I would play the role of the oldest and biggest villain in Equestria's history, and show those ponies just how helpless they would be against a true villain. I didn't know it was all real...

Stupid teenager dresses up as your favorite villain from your favorite movie/show/book/game, buys an amulet from The Merchant, is sent to Equestria, Celestia imprisons him for 1,000 years, he breaks free and goes on a quest for revenge.

A remake of the original and highly controversial Conversion Bureau story by Blaze. Newfoals are not smiley zombies. Celestia isn't evil. The villains are the HLF and the PER. And Humans are simply awesome.

A team of 6 OC SPARTANS from a FANON version of the Halo universe end up in Equestria. Crack ensues.

Fluttershy makes the ultimate sacrifice to save the world. This is the saddest goddamn thing you will ever read in your life.

Every few years Fluttershy and Angel have to save Equestria from the satanic Christmas Critters.