Lucky you. Happens to me more times than I can count.
Anyway, hi, I'm Buffy. You're pretty You've landed in Lawrence, Kansas, courtesy of some wacky biblical seal thingy that likes to kidnap people from lots of places. You might be fictional - Googke yourself if you really wanna know, only don't really because that only leads to badness. Face twins are also a thing, so don't be surprise if you bump into people who look like peeps you already know.
Also, there are demons and angels and they actually have classes on all this, so sign up if you want more than the cliffs notes. Or, you know, sign up anyway, cause it's better to know what's out there.