A man wakes up to find he's inhabiting the body of a cartoon horse who wasn't exactly Mister Popular, judging from how shocked the locals are when he says things like 'please' and 'thank you'.
After a severe thunderstorm, a fire lookout awakes to find himself in odd forest and cut off from all contact. On the bright side, at least the fauna is friendly. Well, most of it.
After being left behind in the badlands after her expedition is attacked by a dangerous monster, Twilight Sparkle must survive a hostile, alien environment. Lucky for her, she has some help from one of the natives: A curious changeling named Thorax.
To be able to live in Equestria, I have to perform a certain job. I have to be a checkpoint inspector. The princesses insisted that it’s because I’m good at it. I just think they know that I don’t like people/ponies/anyone that are stupid.
There comes a time in every earth pony mare's life, when they just feel like digging a hole and sitting in it. Anon doesn't really get it, but decides to keep Pinkie Pie company during this trying time. (RGRE)
A human soul is stuffed into King Sombra's body. Having no idea what's going on, and thinking he is in some kind of coma, he just casually strolls into the Crystal Empire.
Rainbow Dash finds a maimed, unconscious young colt on the edge of Ponyville and rushes him to the hospital, but nopony knows who he is and something about him seems off...
Prince Blueblood. Last of his Noble line. Canterlot's most eligible bachelor. Aristocratic, affluent, and arrogant. But, surprisingly enough, a stallion who knows what is truly important in life: Family.
After Twilight's death, it's up to Trixie to save the world from the Necromancer and his spectral army. But since Trixie is the reason Twilight died, most ponies would rather see the world burn than help her.