They can stare for… a really long time.

Bon Bon's voice is funny, and that's about all that anypony who meets her notices, as her marefriend Lyra soon steals the spotlight with her explosive personality, strange obsessions, and curious beliefs. And why not? Bon Bon is, after all, a perfectly ordinary, boring pony in every way but two: her voice, and the carefully kept secret that she isn't really a pony.

(Edit:) Now with an annotated version, courtesy of the incomparable Shoggoth Lord!

Going up to the roof for some fresh air after pulling and all-nighter, our "hero" makes the mistake of closing his eyes for a bit.
When he opens them again, he is no longer on the rooftop in Copenhagen he was expecting to be on... no he's somewhere very different, and extremely unfamiliar.
How will he react? How will the ponies react? Nothing is certain, except for one thing...

He never asked for this.

This story takes place about 8'ish years after the second season of MLP:FiM, the language of Equestria does not match any earth languages (that the main character knows of at least), and the human in question knows nothing of these ponies or the world of Equestria.
He emerges into Equestria on the roof of a building in Manehattan, not the Everfree, not Ponyville and certainly not one of the princesses' bedrooms in Canterlot Castle.

Oh! Spoilers in the comments and all that jazz, not gonna go into a whole spiel about it.

A thousand years is quite the generation gap, so Princess Luna decides she has to get with the times. However, this isn't quite as easy as she thinks it will be...

After the disastrous invasion of Canterlot, an injured changeling wakes up near a small cottage and is quickly discovered by two of the last ponies she ever wanted to see. Now, with the help of her new "friends," she has to remain undetected in a town high on changeling hysteria that would not hesitate to throw her in the Canterlot dungeons should her true nature be revealed.

Simple, right?

Too bad she couldn't have picked a worse form to stay inconspicuous...

Many thanks to ZuTheSkunk for the cover image!

After the Changeling's failed attack, a full-out crusade is set against them. Many find a way to simply slip away. One is hapless enough to fall into the hooves of those his kind fought against. The changeling is promptly sent to the only pony Celestia could trust with such a thing.

Completely revamped, and thanks for constructive criticism and support behind the scenes (you know who you are, people).

After Chrysalis failed to conquer Equestria, she was shamefully stripped of her title of "Queen of the Changelings".

Their people now leaderless, the Changeling race now finds itself in a unique situation. In the struggle for power, one Changeling seizes the attention of his people. Can he overcome his nature, and the nature of his people, to lead them into a better future?

A lone changeling begins to question the invasion of Canterlot. However only by meeting a certain pony will the monster make an important discovery.

Princess Celestia tires of constantly being surrounded by decorum, deference, and formality, and decides to take a day off from being Princess. But visiting Ponyville incognito is harder than she expects. Will she be able to fit in and make friends without blowing her cover?

My name is Canvas. I remember because I wrote it in the corner of the white box. It takes twelve steps to get from the cot to the wall. And the lights hurt my eyes.

(Note: The story isn't in color because I decided to try this without the gimmick! But I still recommend reading the GDocs version.)