I used to believe that "testicles" and "intestines" were the same thing. So once when my dad had me pinned down with his leg so he could tickle my feet, I started to scream, "Move your leg you're squishing my testicles!"
Oh ya, I'm female, and yes my parents STILL laugh about that day.
A childhood belief about speaking

others believed things like this
- I used to think pee was in your testicles.— R.G.
- When I was young I used to think my testicles held the pee!Anon
- I used to believe that testicles were called tenticlesAnon
- I used to think that 'testicles' was the word for the arms of a squid or an octopus. — Emily
- I used to confuse tentacles and testicles when I was younger. It was funny— Chelsea
- We had a male cat that wasn't neutered. I thought his testicles were just the cat version of a butt.— Robyn