Powered by air and water, the AirKick launches people over 26 feet in the air and into either a pool or a foam pit. Creator Jochen Schweizer explains it thusly:

It propels participants through the air in a pre-calculated parabolic trajectory using a special combination of air pressure and water recoil technology. Approximately 60 Liters of water are then forced through a rocket nozzle under the seat. This pressurized water (8 to 10 bar of air pressure) propels the participant 8 meters though the air for a cool and refreshing splash down in a swimming pool.

It's available to rent in Germany. There are no words to describe how badly I want to use this thing. Sigh. [AirKick via Baller House]