The USB Rock Star. Dancing and gyrating in time to your music? Priceless! In this case literally. [Thanks Robin]
If you truly want to get back at your coworkers, plug the USB Rock Star into your systems USB port and crank up the Britney Spears. The little Elvis like man will gyrate and dance in time to your music and generally annoy everyone in proximity to you. Compatible with Windows XP and uses Windows Media player. The device also has LED lights that flash in time to the tunes as well.