You want this. Really, you do. Look at it. Isn't f'n sweet? Just think how rad you will look walking through a grocery store, talking on your phone now. Best of all, ThinkGeek has it on sale with a coupon code.
There is a little catch though in order to use this coupon code: your order has to be over $30 bucks. However, if it is, enter SARK to drop the cost of the headset down to $19.99, which is a fair price for a novelty piece such as this. It's not like you are actually going to use it that much anyway.