When I was young my grampa would always tell us to duck when going underneath a bridge, in the car, or we would bump our heads. Also, to hold our breath when going through a tunnle because the air was bad. Guess, he thought it was funny.
A childhood belief about cars

others believed things like this
- If you hold your breath and make a wish under a highway tunnel it will come true....I still hold my breath :)— aj
- Whenever I was upstairs on a bus, I didn't believe that it would fit under the bridge so I used to duck. — Dave, Lancashire
- i thought that "aromatic" duck was actually "asthmatic" duck.
poor thing...— rachael - I always thought that duck sauce (from chinese restaurants) was duck poop.
— emily - when i was a little kid. i used to think that when u hold ur breath ur heart stops.. LOL :P — Annonymus
- I still hold my breath when I pass by cemetaries because it is impolite to breathe when other people can't.— Crystal