Survival Research Labs has been repurposing hardware into giant, deadly displays of machine power since 1978. They say the plank hurling Pitching Machine is their most dangerous made during all that time.
It's basically a machine that uses the power from a 500 cubic inch El Dorado engine power wheels, which launch six foot long pieces of 2" by 4" lumber over 120 miles per hour. That's fast enough to penetrate an eighth inch of steel plate. Even better, this machine uses an autoloader that can run through its 20 board clip in 10 seconds. An oldie, but a goodie. Thank god its not a computer controlled bot. [SRL]