LMAO
well have u ever walked down the street & saw a man moving his lips & talking, but didn't see anyone with him & you thought hat eh was nuts?? Well maybe he was talking into a bluetooth. It's like a wire less cell phone thingy attached to your ear & talk to on the "phone"
a guy here has one on:
http://www.theonion.com/content/files/images/Bluetooth-Headset.jpg