Every famous sportsman has a signature move. A crossover dribble, a quick change of direction on the ice, or a celebration dance after a touchdown — the players become synonymous with the move, and vice versa. But among coaches, who typically pace the sidelines and occasionally shout out commands or encouragements, only a select few have gained notoriety through a signature move.

On this day, February 23, in 1985, in a college basketball game against Purdue, Indiana coach Bobby Knight for the first time made what would become his signature move. Protesting what he thought was a foul of one of his players that did not get called,  Knight picked up an empty folding chair from behind him, and tossed it across the court.

Knight tended to lead his teams to great successes, but he also had a long history of tantrums. Before the chair incident, he was sentenced in absentia in Puerto Rico to six months of jail for striking a police officer. In 1987, with his team down in a contest against the Soviet National Team, Knight started an argument with the referees and refused to let his team out in the second half, forfeiting the game. His subsequent explanation to Connie Chung got him into even more hot water with womens’ groups.