I used to believe that "rotating your tires" actually meant that they just rotated the tires on the axel and put them back. I don't know why that made sense to me, but it did. I'm embarrassed to admit that I found out this was wrong in my mid 20's. My significant other and my mom still laugh at me for this.
A childhood belief about cars

others believed things like this
- WHen I was a child I used to believe the sun rotated between day and night.— Hao
- I believed the sun and the moon were the same thing, just rotated to change from day to night.— Daniel
- When looking at the clouds and seeing them move I use to think it was the world rotating beneath.— Andy
- I used to think that the priest at church was JESUS.
He had a beard.... it made sense— Joe B - I used to believe that broccoli grew on trees. It looks like a tree, so it made sense, right?— Catherine...
- when i was 2 or 3 believed that i had lots of animals in my tummy it made sense my mum had baby in hers.— kjc