Well, this isn't a belief, it's more an event.
I was at school one day, Grade 3 or 4, and the mailman came past. my friend Lara shouted out to him, and he replied "Mama fungoulo (I'm not sure how to spell it) Lara!" to her. She didn't know what it meant, and we didn't either, so we decided it meant Hello, or good afternoon. So we started shouting it out to people on the street. Unfortunatly, we yelled it to a middle-aged Italian woman who DID know what it meant. We got a detention each, and had to clean the ENTIRE school oval, a big task for 3 8/9 year olds.
(For those of you interested, what we were shouting basically translates into "mother-f***er" or "go f*** your mother"
A childhood belief about swearing

others believed things like this
- As a kid, I thought "No Outlet" signs meant the houses past that point didn't have any electrical outlets.— Julie
- I thought when someone was described as being "mild-mannered" it meant they didn't have very good manners— Samilton Duerheiser
- When I was in elementary school nuns cam to our school. I thought that 'nun' meant they had no religion.Anon
- i used to believe that sex meant love and that having sex meant the two people would live happily ever after.— amy
- I used to think that running cross-country meant you ran across the entire nation!Anon
- I used to believe that a street sign that read "Dead End" meant that there were dead people buried there.Anon