This is a much more realistic take on the Human in Equestria fad.
A human wakes up in Equestria with no memory of who he was, but somehow knows where he lived before. When signs of chaos start appearing in Ponyville, he investigates to find that Discord is up to no good again. Soon enough, he must piece together the few clues thrown at him to find out what exactly is going on. Basically a human in Equestria fanfic with a rare twist: Half of the story is on Earth, the other half in Equestria.