I like the idea of a bodyswap plot. Were you thinking people's physical appearance would change, but powers and whatnot would stay the same, or they would actually hop straight into another body, with all the strange things that would entail? Either one would be interesting, but with the latter you just know that someone would hop into someone else after an ill-fated adventure at Taco Loco.
Aw yeah, poop jokes. Jack's bringing the class into this conversation.