The PS3 Move Ain't Got Anything On This Rig: Mouse And Book Make Motion Sensor

Niel de la Rouviere (him on Twitter) wanted to control Quake 3 with a real gun. Instead of, you know, doing electronics he decided to do something amazing: he taped a mouse to a keyboard and then taped a book to his desk. The result: a motion-controller that works wildly well.

via Reddit