Flint Ball is a game of stone-age soccer played by large audiences. Each member of the audience is given a remote control, and the audience is divided into two teams. Each team is further dived into two in-game "players". For each player the inputs of the remote controls are averaged to determine the direction in which the player should move. There is also a camera connected to the game, and if one of the teams jumps out of their seats then the ball will be kicked forward a short distance.
The audience playing the game seemed to have a great time -- there were many yells and shouts!