So just... let them go. It's easy to do.

Escalation usually doesn't improve things, including for the person displaying the universal finger (or throwing the lug nut).

You've got a choice: You can keep plodding along in your truck while you escalate and retaliate and get all grumpy and stuff, or just keep plodding along in your truck without any of that noise.

The errant, instigating driver won't really learn anything either way.

> The first weapon to be employed is a Middle Finger. If that proves ineffective, it's followed by a lugnut taken from a coffee can that I keep handy. If and when things get to that level, the person usually wises up quick and finds a new hobby. There are other tools available if the nutcase decides to escalate further.

I, uh, okay but I hope you realize that this is far more extreme than what the other person was suggesting!