Or those shiatsu massage pad things you put on a chair. I LOVE BACKRUBS but unfortunately don't own a slave to give me one every day. For a long time I've been dying to buy one of those things, and whenever I go into Macy's or somewhere that has them, I HAVE to use it for like 5 minutes.
Everyone I know who has one, never uses it, or says that it hurts their back.