Last winter, I had a refrigerator die on me, so naturally I tore everything out of it that still worked. This included some relays, a light socket, a heating element, and of course the little switch that turns the light on when the door is open.
About 5 minutes later, it was wired up to the socket that was just obtained with a short chunk of speaker wire. Cool. My roommate Gigawatts and I had some networking stuff in one of our closets with no light so we threw this little device in there with a little bit (really a lot) of hot glue. Here's a quick pic and a short, but awesome video starring Gigawatts' left hand.