heh, whenever i catch people looking at my direction in the car I wave and smile or dance in my seat, provided they don't seem TOO creepy. try to get a small laugh out of 'em if possible. once i got a couple of people to dance in their respective cars with me in the south of france during dead stop traffic..to techno. pretty impressive, i thought.
but most likely i'd try and mimic you just for kicks, as pictured! x
bahaa I do it, I find it more amusing when Im driving and at traffic lights and a guy in a van with a burger wrapper on the dash looks at me and winks >_< lolzz