My dad was a Vietnam vet and when I was little he would tell me about different things he saw/did while there. It was never anything war-related, it would be more like "I saw a lot of monkeys like that in Vietnam" or "It used to rain a lot in Vietnam." I thought that being in Vietnam, then, was something men went and did before they were qualified to become fathers.
Of course, I learned otherwise.
A childhood belief about history

others believed things like this
- I was convinced that Gorilla soldiers in Vietnam in the 70's were real Gorillas attacking other Soldiers.— Mario
- I used to believe that monkeys were related to fish as they both have mouths!— Quako
- I used to believe that all my aunts were related to my mother and all my uncles were related to my father.— Mandy
- My dad thought when he was little, rain was caused by army guys in the clouds with rain guns. — Daughter of the Weird
- I used to believe I could control the weather by singing rain rain go away or blowing the clouds away.— Shannon
- I believed that the rain would melt everything...I was terrified to go outside in the rain! — Cris