I have been called "aggressively well-mannered" because it drives me crazy when people aren't polite. I get particularly angry when you go out of your way to let some poor guy into your lane because he's too timid to just barge in like most people and you don't even get a little wave of thanks. Wako Corporation in Japan has come out with a device for people like me, who believe in expressing gratitude when someone is nice to you. The Thanks Tail attaches to the roof or trunk of your car and gives a friendly wag of thanks when the remote button is pushed from inside the car.

This looks to be Japan-only right now, but I'm going to start an import business to bring this to the rest of the world.

From Nikkei Weekly (subscription required).