When I was little I heard my mom talking about someone "being behind bars" which means they are in jail.. Well.. I thought that it meant that they hung around behind bars.. Like where you go to get drunk.. Yeah I wasn't very bright!
A childhood belief about criminals

others believed things like this
- I used to believe women were not allowed eat yorkie bars
— greg - I used to think being engaged meant being in jail. I have no idea how I came to that conclusion.— CNB
- I use to believe that if you ate too much grapes, you'd get drunk.— Grace
- I used to think that being drunk was permanent— Boyd
- When I first heard the words "flea market", I actually thought it meant "selling fleas".Anon
- For years I heard the word "pedophile" and thought it meant a pedicurist's tool.— Lauren