I used to believe that when people tailgating before a sporting event meant the same as tailgating on the road, and I wondered why people would drive around for hours really closely behind people before games. I believed this well into my teens!
A childhood belief about cars

others believed things like this
- I used to think that "cross-eyed" meant that people had X's for eyes, like dead people in cartoons.— Tim
- I used to believe that boarding school was where people went to play board games.Anon
- i used to believe people were put in coffins because they were special cars that could drive you to heaven!— jym
- I used to believe a tornado was a omato flying around and wondered why people were afraid of them.Anon
- i used to believe that sex meant love and that having sex meant the two people would live happily ever after.— amy
- i always wondered why people sent plums to the queen, in the anthem "send her victorias"— anon uk