Or that one episode of Supernatural where everybody's wishes came true, and you had stuff like the teddy bear coming to life and just sitting in a chair sadly watching the news, bemoaning what a terrible and sad place the real world is. Then at the end you find out he killed himself by ripping out his own stuffing.
Or that other episode where a bunch of old fairy tales turned into real murders because of a ghost, or the one where everything the little psychic kid thought was true came true. Which makes me wonder how many times the show actually used this plotline