i'm not sure what category this would go in, but i always thought that rear view mirrors in cars had to be positioned very exactly and that it was really hard to adjust a rear view mirror just right. as a little kid i would always freak out if i accidentally bumped or moved it out of position.
A childhood belief about cars

others believed things like this
- i used to belive that pay-per-view was paper view.— matt b.
- I'm scared of mirrors because I think that there are ghosts in mirrors— est
- When my brother was little he heard the song "Le Freak" by Chic (Ahhh, freak out!) like this: Ahhh, free cow!Anon
- I thought the no overtaking sign meant that red cars cannot drive by black cars.— Helen
- I thought small cars grew up to become big cars— carhugger
- when i was young i used to believe that my image on a mirror would come to life if i broke the mirror.Anon