Nice one there, for about $20USD you can have an LED sign in your car that will display the handy messages "thanks" and "back off". It will also display a happy face and a sad face. Just the thing to let other drivers know how your feeling. It would be cool if it used a big LED matrix that you could program but the chances of someone pissing off people with language that was, shall we say less than clean, is a sure thing.
Helps you improve communication with other drivers & express yourself. Fix display module to rear windscreen & use remote control in the front of the car. Battery operated – No Wires – Single and Multiple message options.
[via MAKE]