From Japan, the latest gadget to promote courteous driving- the Thanks Tail. Controlled by a joysick, the tail wags to thank the driver behind for letting your car cut across into their lane, or can be used for more expressive gestures. Check out the video.
Technorati tag: Japan
I can imagine it giving some legal trouble in the UK as any non-standard gestures (such as waving or flashing someone on) would mean you bear responsability for any unfortunate outcomes.