A sport played by two men or women, in a series of rounds lasting two minutes, where the boxers hit their opponents face or chest, until the opponent is knocked unconscious for 10 seconds.
This is the only sport requiring a win from knocking another unconconscious. It is also a dangerous sport, with a good chance of retiring early with a permanently damaged brain.
Where a person or persons normally outdoors, attempt to slam an empty cardboard box over the head of an unknowing pedestrian, then successfully running away.