I usually just wave like I'm really excited to see them with an over eccentric smile...It usually infuriates themHow do you typically respond?
Do you flip them off back? Do you brush it off? Do you wave a Glock around? Curious which of you are mentally stable, and which of you are lunatics.
If they're behind me, I usually flush through my windshield washer fluid until it's bone dry so they have to use their wipers. I get a chuckle out of that sorta thing.