My son's grandmother had a pet peeve, which has since become one of mine.
We'd watch a major-league baseball game, and she'd say "Look at them! Where were they raised? Don't they know that when you listen to the National Anthem, you stand at attention? They're saluting the flag, for pete's sake. If they were in the army, they'd stand at attention to salute the flag, or an officer. So what's with this head-bowing? They need to go back to school!"