I know a guy who did this a couple of years ago and knowing him in other contexts I can safely say he has at least half a screw loose. When he was there the big celebrity there to run with the bulls was Dennis Rodman. 'Nuff said.
I would much rather take part in whatever harvest festival that is in Spain where those present pelt themselves with tomatoes. It sounds like a lot more fun than running from something weighing 700 poounds with sharp horns.