On November 19, 2004, Indiana Pacers forward Metta World Peace (then named Ron Artest) laid on the scorer's table at the Palace of Auburn Hills, former home of the Detroit Pistons, where a confrontation was afoot. With 45 seconds left and the game in hand for the Pacers, World Peace had committed a hard foul on Pistons strong man Ben Wallace, who reacted by pushing World Peace and sending him to that aforementioned spot to cool down.
Then, it happened -- a blue cup thrown by Pistons fan John Green pegged World Peace, who charged into the stands and set off a vicious melee between players and fans.