I used to believe that Ham came from Hens, and that Hens were a completely different animal, not related to poultry.
A childhood belief about general

others believed things like this
- when I was a kid. I used to believe hens had teeth.— lév michot
- i used to believe that sausages were to pigs as eggs are to hens— stuart swanston
- I thought when Grandma's hens were cackling, they were giggling about some private joke in the henhouse. — Not a farm kid
- I used to believe that all my aunts were related to my mother and all my uncles were related to my father.— Mandy
- When I was a child, I used to think that if you eat an animal, you become that animal
— Hmza - I used to believe that people with the same first name were related.— Rebecca