Boing Boing tv's embedded robo-combat reporter Xeni Jardin witnesses warfare inside Robogames and Combots at Bay Area Maker Faire 2008, where robots battle until death -- or at least 'til one competitor busts a sprocket.
Next, BB-gun wielding battleships go BOOM!, with the Western Warship Combat Club. Participants painstakingly re-create historic battleships on small scale, and outfit each warboat with actual artillery. He who sinks last wins. The cameraman took a pellet or two in the pants, but the goofy safety goggles kept all eyes intact.