Want to make those tail-gating idiots look even stupider? When they're on your ass, do the "attention check". (simimlar to a brake check) Instead of hitting the brakes hit the emergency flasher let it flash only once, but while doing it accelerate. The clown behind you is watching for brake lights, when he gets the surprise of emerg. lights they're ALWAYS on the brakes and hard. While they're in "nose dive" mode you're blasting away from him. Anyone behind him is seeing just how much of a moron he is. This works great in hwy traffic. I did this to a guy 3 times, he finally passed me on the shoulder (he was so pissed) only to get the attention of a cop two lanes over from me.