When I was little, I overheard someone saying that their car had an air bag so it would be dangerous for little kids to sit in the front. I ran to the person's car and saw a plastic bag full of air inside it. For a few months after that I was scared of plastic bags!
A childhood belief about cars

others believed things like this
- I thought brown paper grocery bags would fit more than plastic grocery bags.Anon
- I used to think that doctors added plastic to your face in plastic surgery.— caro
- I used to think that plastic surgery actually involved using plastic.
— JohnJ - I used to believe that plastic surgery was done with plastic knives.— Vicki J.
- I used to believe that cow udders were hollow bags full of milk.Yet I knew that human boobs were solidAnon
- That at meetings adults sat on plastic chairs surrounding a large piece of meatAnon