1) Amusement ride 
The Gravitron (later marketed as the Starship 2000, Starship 3000, Starship 4000, and Alien Abduction) is an amusement ride, most commonly found as a portable ride at fairs and carnivals. The Gravitron first appeared at Morey`s Piers in 1983 and quickly became a fixture at amusement parks in many countries. It is a modification of an earlier ride....