Not really a belief , but a mispronuciation. When I was a freshman in High School I was asked to define an organism in my Biology class. I knew what it was but I called it an orgasm. Repeatedly. I couldn't understand why everyone was sniggering at my "correct" answer.
A childhood belief about speaking

others believed things like this
- I used to think the Senior Center was where all the high school seniors got to hang out and cut class— Jordan
- When I was little, I couldn't understand why people called me a tomBOY, instead of a tomGIRL.— Amanda
- I once knew a girl who used to believe that the sun was actaully a really bright gold fish very high up.— meow
- I used to believe that you got married right after you finished high school or college. Anon
- i didn't beleive this, but a kid my sister knew thought if he screamed in a really high voice, he ran faster.Anon
- I thought that wars had to last four years... just like high school and college.— A. Falk