When I was in high school a million years ago, I made a red light-up middle finger out of a box, some red cellophane, two long wires and the bulb from the cabin light in my car. I attached the wires to the overhead light in my seafoam green 1980 Honda Accord and had the finder in the back window. I used the switch to turn it on or off. It seemed cool at the time… ;)

Now there’s a much less offensive and more expressive option. The Driving LED Emoticon. Might have to put this on my Christmas list.