Here's a bumper sticker I'd like to see: “We are the proud parents of a child who's self-esteem is sufficient that he doesn't need us promoting his minor scholastic achievements on the back of our car.”
The real reason that we can't have the Ten Commandments in a courthouse: You cannot post “Thou shalt not steal,” “Thou shalt not commit adultery,” and “Thou shalt not lie” in a building full of lawyers, judges, and politicians. It creates a
running around the house with a towel tied around his neck with only his boxers on and a Giant "S" written on his Chest Yelling "This Looks Like a Job for..."