Before the bots of Real Steel, humans duked it out in the steel cage cockpits of Bionic Bopper Cars ($17,000). These motorized boxers maneuver around the ring on wheels powered by Honda gas engines with enough fuel capacity for bouts lasting up to 5 hours. Their pneumatic-powered, tire-tread-fisted arms triggered by buttons mounted on two joysticks are perfectly designed for uppercutting a punk-ass or an opposing robot's head. Other features include a sturdy steel frame with fiberglass and aluminum body panels, battery-powered front-mounted display for tallying successful punches and bumper guards for setting the right distance for punches.