The custodian at my elementary school was a friendly guy, and always had a toothpick hanging out of his mouth. One day our class went down to the basement of the school for some kind of drill, and the custodian was there. I asked him why he always had a toothpick in his mouth. He replied, "Because if I take it out, my head will fall off." I believed him absolutely, and for years thought that toothpicks were medical devices used by people whose heads weren't connected properly.
A childhood belief about appearance

others believed things like this
- I used to think my elementary school gym teacher's name was "Jim Class".— Brandon Campbell
- When I was in elementary school nuns cam to our school. I thought that 'nun' meant they had no religion.Anon
- When I was in elementary school I use to think that teacher lived at school at their desks all year long.Anon
- When I was in elementary school, I believed my heart moved across my chest throughout the day.— Allison
- I used to think that blood flowed down one leg and up the other.
And I'm applying to medical school....— Nat - One of my friends in elementary school thought that Osama bin Laden was "a son of Aladdin". Anon