i used to believe that if you ate an animal its ghost would live in your tummy. that sparked some of my earliest (but unsuccessful) attempts at being a vegetarian.
A childhood belief about general

others believed things like this
- Up until I was 10 I used to believe turkey was vegetarian.Anon
- I loved watching the cartoon Casper the Friendly Ghost and wondered why the Holy Ghost never got his own show.— Robert
- I thought the Holy Ghost was the ghost of the Virgin Mary.— Texas granny
- When I was a child, I used to think that if you eat an animal, you become that animal
— Hmza - I used to believe my thoughts came from my tummy.— lollypop
- I used to believe that when you fart, your tummy was breathing!— Nicholas Orsmond