stumbled upon a hacker named who invented a display for the rear window of his car that can send messages to motorists within viewing range.

Singh rigged up a 40 x 16 LED matrix display that he says doesn't obstruct a driver's view because small lights in the grid are only located every 2 cm with space between them.

After affixing the display to his car's rear window he used an AT89C51 micro-controller to feed hard-coded messages and animations to it. While using the display in its current state likely qualifies as distracted driving, Singh plans to make the device updatable via a mobile phone over Bluetooth.

Speaking of distracted driving, while Singh's description of his project looks like the underpinnings of a patent application, he might have trouble actually getting the display into the hands of the masses. Think of those mobile billboard trucks that have been on roadways for several years -- they have a solid by lawmakers and regular people alike for taking drivers' eyes off the road.

Still, having the ability to send messages to obnoxious drivers is an enticing -- albeit probably dangerous -- idea.