When I was young, but old enough to make my own lunch, I thought that if I wanted something warm at lunchtime, all I had to do was heat it up in the morning; If I closed the container fast enough, it would still be warm at lunchtime. Unfortunately, it didn't take long for me to figure that wasn't quite how it worked.
A childhood belief about general

others believed things like this
- I used to believe that I could make a chick hatch from egg carton as long as I kept it warm :)— Stephanie
- When I was young I thought people smoked to stay warm.— Phil Stam
- I use to believe that everyone in Florida didn't go to school because it was warm all year around.— Julia
- When I was little I thought people smoked cigerates to keep warm.Anon
- I used to believe that you could keep a chicken egg (that you bought) warm, and it would hatch!Anon
- I used to believe that bird perched on telephone wires to keep their feet warmAnon