Here's that porch swing video:

http://www.youtube.com/watch?v=qpodXc1Y5vk

That is some of the dumbest shit I've seen in a long time. And they have the nerve to call that a sport! So they got a rope tied around their waist, just incase they miss. I can just see someone now jump out into thin air, then come crashing down, pulled by his rope, headfirst into a wall. Considering how deadly a miss is, and how often they do it, I'd bet they have a pretty good chance of dieing, pretty fast.