HAHA, yea, me and my friends do that shit all the time.
Every friday they have open gym, at a local gymastics place, so we go there to screw around on their stuff as well. http://www.youtube.com/watch?v=iTKrGFHRTtQ&feature=player_profilepage#
It's pretty old but it's decent.
It's all about double flips and double corks now haha.
me and mike lee used to run this shit when he had a trampoline. i can still double front flip and do big spins and stuff, but i havent had access to a trampoline in like... 2 years.
tramping it up is fun.... i can do backys, 360 backys, flairs, barrel rolls, front flairs, front flips. was trying double backflips with me mate the other day and landed on my head lol
there is a place called jump street in denver with the whole floor and walls are trampolines and i can like back flip 360 off the wall and all kinds of fun stuff!