I used to believe the white marks on my fingernails represented recent lies I had told. My parents told me this and I believed it for years. I was too young to wear nail polish and couldn't wear gloves in warm weather and therefore became a very paranoid, yet truthful child.
A childhood belief about general

others believed things like this
- I used to believe that my choice of pyjamas to wear would determine the following day's weather.— Pyjaman
- when i was young i was told that thunder represented god moving the chairs about— lips
- One kid I know believed that because I wear glasses, it wouldn't hurt if he poked my eye.Anon
- I thought that exclamation marks were actually "explanation marks", since they explain how you pronounce it.— superoid
- Polish war memorial ,I thought it was an instruction.as in to polish— oddsox
- I used to think that all judges had to wear those wigs.— M