I’ll bet you hadn’t heard of the Cloaca Machine yet. It was constructed by Wim Delvoye, a guy in my neighbourhood I knew when I was a kid. It basically works like this: you feed it with whatever food suits your fancy, the food gets processed through some sort of artificial digestive system, and at the end of the device, out comes: poop! The museum visitor gets to purchase a poop for about one euro per poop.
Beats having a light go on and off and claiming it to be art, if you ask me…