Whenever I see a black SUV or Prius make an especially aggresive and dangerous maneuver I check the bumper to see if it has a TCP number. I can't remember what TCP stands for, but it's for limos and such and it means the driver is probably going to do something illegal. Staring at bad drivers is definitely a bad habit that serves me ill and doesn't improve the world, but I have trouble letting go of my astonishment at drivers trying to, for example, turn left across three lanes of heavy traffic. I'm not quite enough of a busybody to call in complaints or anything, but in the case of this vehicle it would have been futile anyway:
Maybe a) they shouldn't allow cursive script for TCP license numbers and b) they shouldn't let the drivers apply it themselves, lest they do as bad a job applying stickers as they do navigating traffic.