Double the fun

A large trampoline attached to a supporting four legged framed structure,firmly affixed at ground level,with a identical trampoline structure firmly affixed at ceiling level.

The attached structure on the ceiling can be lowered and raised,the reason being that all 4 corners of the 2 trampolines themselves are hooked up to independent roped pulley systems.

8 people control the tension via the pulley systems from each corner,which is variable from slack to tight on both trampolines, depending how hard each person pulls the ropes .

Now have someone sit in the middle of the bottom trampoline,which is now slack,the brakes on the pulley system will prevent the trampoline from touching the ground and allowing to clear say 2 feet.

Attach a safety net upright around the entire structure. Starting from each corner at the bottom,the 4 people will start pulling on the ropes ( creating the effect of tossing someone or something on a blanket ) with the tension getting tighter bouncing the person in the middle higher and higher till they reach the top trampoline,where the other 4 people use the top rope pulley system to bounce the person back down again.

Once momentum gets going each of the 8 can coordinate various tensions bouncing the poor sod at different angles and up and down very fast.(crash helmet recommended)

This should be performed ideally in a warehouse or a similar building.

I didn't know which category to place this in,so I hope it doesn't get bounced outta town.