Might have to get one of these myself!
http://blog.scifi.com/tech/archives/2006/06/22/drivemocion_mak.html
"Usually there are no ways of letting other drivers know what you think of them other than the one-fingered salute or slamming on the brakes, but the brilliantly named Driv-e-mocion aims to allow you to be a bit more expressive. A small electronic display sticks on your back window, which you control from the driver's seat, displaying smiley faces or frowns as well as short messages like "thanks" and "back off."
http://blog.scifi.com/tech/archives/2006/06/22/drivemocion_mak.html
"Usually there are no ways of letting other drivers know what you think of them other than the one-fingered salute or slamming on the brakes, but the brilliantly named Driv-e-mocion aims to allow you to be a bit more expressive. A small electronic display sticks on your back window, which you control from the driver's seat, displaying smiley faces or frowns as well as short messages like "thanks" and "back off."
