When I was smaller I always thought that instead of the water filling the glass from the bottom up, it would fill from the top down.
A childhood belief about physics

others believed things like this
- I thought the name Phillip was actually spelled "Fill Up"— Natasha H
- I thought when you get married you have to fill out a form to get a baby and then you get one.— Danielle
- I thought the big hand was for the hour and the smaller one was for the minutes until i was in third grade.— Time Challenged
- I thought God drove a car like ours - a Honda. The song DID say "fill the heavens with sweet Accords..."— Dummy
- I thought that hydrogen was pure water (since I knew hydro- meant water) and H2O was impure some how— Hexetic
- I used to believe that your bottom teeth were actually in your bottom— jez