I've never been in anything more than a beeping / digit showing competition myself but my cousin said he was in a very scary situation once.
He was driving through London and pulled out infront of a car when changing lanes causing the other car to slow. Now a friendly hand in the air to say sorry would probably done the trick but my cousin thinks he's in the right 24/7 and just carried on his way.
He stopped at a junction and the guy gets out of his car and starts running towards his car, obviously he just floored it. He now knows that the guy wants more than just words with him so he pulls up sharpish around a corner and jumps out of the car. The guy following pulls up by which time my cousins already running at his car, the guy starts to get out but my cousin boots the door shut on his leg, then as it bounces back gives it another one for good measure and sprints back to his car and speeds off.
I was horiffied when he told me
![Frown :( :(](/styles/default/xenforo/vbSmilies/Normal/frown.gif)