I used to think that filling a plastic bag with air took away the gravity inside.
I spent many hours at my grandmothers testing this theory with a plastic sandwich bag and a ten cent coin.
A childhood belief about physics

others believed things like this
- 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.
- That at meetings adults sat on plastic chairs surrounding a large piece of meatAnon
- My Dad told me that the big bales of hay wrapped in plastic sitting in the fields on farms were cow eggs.Anon
- I believed that if I swallowed my phlegm I would die. I spent hours spitting it out into the toilet.— chunky munky