When I was little my parents pointed out the gravestones in a graveyard and explained that it was where people had been buried. I didn't realise they meant people were buried in the ground, I thought people were literally buried in the headstones. For years, everytime I walked through a graveyard I'd try to figure out how they could possibly fit a body inside them (surely dead people weren't that skinny!). I was particularly baffled by how it was possible with the simple cross shaped gravestones. I felt so ridiculous when I finally found out the truth.
A childhood belief about people

others believed things like this
- I thought that dead people were stuffed INSIDE their gravestone instead of buried in a coffin.— Sam Shiels
- I used to believe that a street sign that read "Dead End" meant that there were dead people buried there.Anon
- I used to believe that people were buried in "grates".— Grate Job
- I thought the cremations were for people that wanted their love ones buried at home.— Helen
- 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 a dead end sign meant there was a graveyard at the end of the street or zombies — Still Out There