A bit like Evel Knievel, but with cars and bikes. You mount the car/bike on a ramp with a fat air pump on it. Then pump like mad until the internal air jet driven gyro gets spinning really fast, then release the lever and ...WOW!. I managed to jump the bike completely across the street (20 ft of so). The pump made an awful high pitched screeching noise that drove my parents mad, and freaked out my cats! One of the best toys I ever had, way better than Evel Knievel.