I used to believe that potatoes were made out of bread AND bread was made out of potatoes. I'm not sure how this worked... something along the lines of people digging up potatoes to make them into bread which would be made into potatoes and buried again!
A childhood belief about general

others believed things like this
- I used to think potassium came from potatoes.Anon
- I used to think clouds were mashed potatoes in the sky.— Will
- When I was a child I used to think potassium came from potatoes.
— Julen Peinado Gomez - my mum use to say if i picked my nose potatoes would grow of it— becky page
- I used to believe that eating raw potatoes would give you worms, like dogs get.— A Wild Cowgirl
- My grandpa and mom both used to tell me that if I didn't clean behind my ear that potatoes would grow there. — Bryan M.