When my husband was a boy, his uncle told him about cows that were specially bred to live on hillsides. They were called "sidehill gougers" and they had legs that were short on one side, long on the other. Farmers bred them in both left- and right-handed versions, but had to make sure to put them in the correct pasture, because if you got it wrong they'd fall down the side of the hill.
Hubby believed it for years!
A childhood belief about general

others believed things like this
- When I was young I believed that the windmills found in farmers fields were used to keep the cows cool.— Linda
- I used to believe that "pork chops" were called "port chops", and came from the left side of the pig.Anon
- I used to think a female daddy-long-legs was called a "mummy-long-legs".Anon
- I used to believe that if I chewed on one side of my mouth too much the other side would get jealous.Anon
- I use to think that there were HILL COWS!— Erin
- That when u opened all the windows on just one side of the car the wind would make it tip over.— Schmackalie