The Fae Realm

Whenever humans find themselves trapped in the Fae realm, it's safe to say they've probably fucked up. Generally, it doesn't matter much whether you made eye contact when you shouldn't have, ate something you shouldn't have, or told someone your name when you shouldn't have, since that knowledge won't do any good once your soul is owned. Most likely by a bizarre looking creature that tells you to do some human thing like draw a picture or do long division as if it were telling a dog to do tricks, or perhaps it wants something stranger from you.

Of course, the POV character doesn't have to be a human lured into a deal. Could be anything you can imagine.