We all believed at primary school (aged 7-11)that any single teachers of the opposite sex were always having a secret, passionate affair. I suppose it was being kept a secret from our stern headmistress.
A childhood belief about teachers

others believed things like this
- When I was young,I thought the lyrics "Secret Agent man" were actually "Secret Asian Man".— M.M.B.
- I believed that our teachers lived at school. They were teachers--they had no reason to leave :)(Anon
- i thought that our cats were secret spies for my parents and i would never do anything bad around them. Anon
- I used to think that James Bond and all the other secret agents worked for MFI.— John C
- I used to believe there was a secret door to the gremlin world hidden under my bed— Mel
- I used to believe Jessica Simpson was a secret character from "The Simpsons"— Lemon Jelly