Everyone has pet peeves, whether you hate people clicking their pen during meetings, smacking their gum, or talking with food in their mouth, almost everyone has something that drives them nuts. Me I hate people in the left lane who drive slow. the left lane is for passing, if you're not passing move to the right. If I'm trying to pass and I flash my headlights at you it's a nice way of saying please move to the right, out of the passing lane, I need to get by. Otherwise you'll force people to pass on the right and that is dangerous and not exactly legal. Just because your car is a slow piece of junk doesn't mean you get to slow down everyone else on the free way, just move over.
oh how I wish they would allow a little rubbing and bumping on public streets....