Here's a slick little video of some guys doing simply amazing things on a trampoline.  My dad had one in the backyard, and I used to get in trouble just for trying to do a flip or something, because my little sister was watching and then she'd try the same thing.  I have no idea if any of these guys have little sisters, but I can guarantee they wouldn't be allowed to pull this crap at my dad's house.  These guys are working that trampoline like Forrest Gump works a ping pong table!