In traffic, your means of communicating with other drivers is pretty limited. You have no way of telling for sure if another driver saw your thank-you wave—or heard what you screamed at them from your window. The Drive-e-mocion is here to help.

Developed by London-based AU-MY Ltd., the Drive-e-mocion is an electronic display that sticks to your back window; you operate it by remote control from the front seat. It can display a smiley face or a frowning face, along with the messages "thank you" and "back off."

Say you're stuck in traffic; hit the frowney-face and invite fellow motorist to share in your frustration. Express your gratitude to the driver who waved you through with a flashing "thank you." Someone riding your bumper? Flick on the "back off" message and let them know who's boss. And a smiley could open a whole slew of new flirting opportunities for you.

The Drive-e-mocion only comes with these four displays, so far. If you're looking to use more colorful language, you'll have to wait for a version with customization options.

The good news? The price is about 9 pounds sterling, so if you can find one on eBay, you're in luck. The bad news? The company is revamping the product, and the company is officially out of stock until the new model ships in "early 2006".