I bought this for myself the other day:
It's a head massager, because I love having my head massaged. The intense pleasure it brings to one's scalp is so great in magnitude that I have to force myself only to use it once a day, lest I be found by my friends and coworkers, weeks later, in a drooling stupor, bald and skittish...a horrible Gollum-like version of my former self.
Anyway, what I'm trying to say is that you need to buy one. Right now. So we can talk about how good it feels and make everyone who doesn't have one insanely jealous.