Performance artist Bob Flanagan got his name for forcing his body to endure extreme torture. A longtime sufferer of cystic fibrosis, Flanagan pushed his body to the limits in order to find out how much he could take. His outre acts got him mainstream exposure. He appeared in Nine Inch Nails' "Happiness in Slavery" video, trapped in a torture machine, and in Danzig's "It's Coming Down," in which he can be found hammering his penis to a block of wood. For real. The blood spatters against the camera's lens. Now that's art.