I'm just being facetious but the guy should have some type of decals of cars or people he's hit painted on the side of his car like the pilots of fighter planes did for the number of enemies they shot down.
I am aware of that but the vast majority of folks have no idea when their car was made. Personally - I have never heard anyone going by anything but the model year. My car is a 21001 but made in Nov/Dec 2000 - I go by model year since everyone I talk to in my life uses model year.
The folks who go by molder years are gear heads as well. Serious gear heads... As in a collection of production and race cars for BMW. -- Brian
"It drops into your stomach like a Abrams's tank.... driven by Rosanne Barr..." A. Bourdain