If someone does something that really puts me in some danger I'll holler "Hey". Just to let them know that they're doing something that should be corrected. Half the time I figure it's some testosterone-poisoned a-hole who's trying to prove he's gottest the biggest set in town. The other half of the time it's just some oblivious jerk.

I have to admit that I am not very tolerant of rudeness. When something like this happens it really gets under my skin. The hard part is letting go so I can enjoy the rest of the ride and not fume about ways to get even. But the best action is really just letting it go.