Doc, this one's for you. Be forewarned, at the end of a lengthy disclaimer, the publishers say, "DON'T HURT YOUR LAPTOP. YOU DON'T HAVE TO SWING IT SO HARD, YOU KNOW. IF YOU DO BREAK DAMAGE TO YOUR MACHINE IN ANY WAY, IT IS YOUR FAULT."
The program is MacSaber. MacSaber is compatible with Mac laptops equipped with Sudden Motion Sensor (SMS) technology. It uses the SMS to command a really good light saber sound so that as you move your laptop around the sounds match. It's totally useless but extremely cool (in a nerdy sort of way)! You can get MacSaber at the iSnoop.net blog. Remember, your laptop is expensive so BE CAREFUL. And may the force be with you!