About a half-mile away from us is a inflated device that looks like a lot of fun.
You seat your "victim" at the red-color end of the float. Have a friend climb a ramp to an elevated platform. Your friend jumps off, hits the yellow part, and launches the victim into the air. In this case, it took two friends to jump at the same time get this picture—and here, the "launchee" may have been launched even higher than the camera's shutter could capture!
(Boaters should stay 150' from shore).