Guitar Hero launches Air Guitar, a fun and entertaining game. As you can see in the picture above, you attach a sensor belt buckle to your pants along with the mini amp. The pick then tells the amp to make sound when the guitar pick passes by the buckle.
That was fun! Update: Commenter, Raider, points out that I do a better job at this air guitar than the last time I tried it in the Vlog Death Match. I was in good company too: Veronica Belmont, Casey McKinnon, Miki Krimmel, Bony Pierzina and Zadi Diaz.