I used to believe, as a child, that horses were male cows.
A childhood belief about general

others believed things like this
- When I was little I thought cows married horses, cows were all female and horses were all male. — Sheila
- I used to believe cows were ugly horses— Marlene
- I used to believe that milk came from cows, so water came from horses. hahah— Melissa O'Connor
- I used to believe that cats were the girls and dogs were the guys. Same with cows and horses.Anon
- When I was a child I used to believe that cows gave ready butter.— Bane
- I thought the word mailman was male man and it seemed dumb to me as aren't all men male?— andalite