The bluetooth headset. Unless you're driving and in the car, take the thing out of your ear. Despite the marketers' ploy to make you think you look cool, you don't. Seriously. It looks stupid. Why do you need to walk around with a piece of plastic permanently affixed to your ear? It doesn't make me think you're any more important. In fact, I laugh at you when it looks like you're talking to the air. If you're using it in the car to keep your hands on the wheel, more power to you. But if you are anywhere besides the inside of your car, take the stupid thing off.