I used to believe that the term 'flat tyre' was a swear. My parents' car broke down one day in the middle of the street. Trying to be helpful, I poked my head between the front seats and suggested it might be a flat tyre. I got a slap from my mum. I thought at the time I'd said something I shouldn't have...
A childhood belief about swearing

others believed things like this
- I never knew how tampons worked, I always thought they would fit in a female flat, like a hot dog.— only me
- I used to believe that the earth was flat.— Rt.y
- I used to believe that if you bled to death, you'd get flat!— Lisa G
- I used to belive the world was flat
Anon - I used to believe that if you bled to death your body would be flat.— -G
- i used to think that if girls were "flat" when they grew up...they would turn into a guy
— kim