Remember the old Roller Racer? Well, bring it back Jackass style. Find a long, straight, steep outdoors stair case that has a lot of flat space at the bottom. A very long wood board will have to be measured by a wood wholesaler to fit the stair case from top to bottom.
The rider will be wrapped in bubble wrap (or an oversized animal costume) and ride the Roller Racer down the staircase board to the bottom at frightening speeds and likely wipeout at the bottom. The bubble wrap (or animal costume) will spare the rider of certain peril!