here is a game i like to play:
When someone starts staring into my car (intown or outta town) i give a huge smile and have profusely and then drive off.
i figure it can only work out two ways:
A) the guy feels like a jerk because he realized i was calling him out for staring at me.
B) he spends the rest of the day driving himself nuts trying to figure out where in the world he knows me from.
either way i have had my revenge!