When we were younger my sisters and I would have to hold our breath whenever we went under a tunnel or bridge in a car. There wasn't really much reason we just thought we had to. This became a problem if the tunnel was very long or if there was a traffic jam inside it!
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
- That there was an underground tunnel linking New York to San Francisco.— Christophe Chang
- I used to believe that the Lehigh tunnel in Pennsylvania was created by Superman.— Holz
- I used to think underground trains actually descended into the tunnel, like a rollercoaster.— Natasha
- 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