That's retarded. And queer. We had a trampoline when I was growing up, and the funnest thing to do was get on with a friend and try to jump such that the other went flying off.
I invented a game me and the neighborhood kids called "Tripper" and the premise was that one person starts the game laying down and is not allowed to stand up. Everyone else tries to avoid being "tripped," which amounts to anything other than feet touching the black surface, by the "tripper," who is allowed to do anything involving his legs below the knees to trip the rest of the players. Tripped players get off the trampoline, and the last untripped player is the new tripper.
Variants included "SUper Tripper" in which tripped players become trippers themselves until it's just two people fighting off a hoard of flailing legs and flying bodies, and The Animal, in which the tripper has player-imposed limitations, such as "stay on your back" or "close your eyes."
I never let on that I'd invented the game so I could flop around on the cute neighbor girl :winknudge:
Needless to say, we all got many injuries during those summers.