Here is another example of USB drive that is attached to the most impossible things. now is the turn of your door bell. It can store mp3 files with any sound you want and powered on AA batteries. You can have it sound like your favorite band or actually record your voice with something like "No one home, come back in a week or two" or even "nicier". Maybe a shot gun for the pizza delivery boy... well I got some ideas as you can see. Check out their funny movie