Cool... it looks like Thinkgeek now carries
USB Missile Launchers. UKadian retailer Marks & Spencer sold these things a year or two ago, but then stopped carrying them, leaving me much-distraught in my search for one.
I think I need to get one of these things and try coupling it with a webcam and the Viola & Jones face-detection stuff in
OpenCV. Maybe I'd also add in a sound clip of that bot from RoboCop saying "Please put down your weapon. You have 20 seconds to comply."