When I was 5, I saw a cartoon where a 100 year old Bugs Bunny said goodbye to a 100 year old Elmer Fudd, as Elmer was tricked into a grave, whereupon Bugs buried him alive. I thought this is how people died when they were old; they climbed into a grave and were buried alive.
A childhood belief about cartoons

others believed things like this
- that if you stuck out your tongue at your mother, your hand would stick up out of the grave when you died.— Elaine. London
- I used to have an imaginary friend named Mr. Nobody. He would protect me from my imaginary enemy, Bad Elmer.— Kdees
- I thought the cremations were for people that wanted their love ones buried at home.— Helen
- I thought that dead people were stuffed INSIDE their gravestone instead of buried in a coffin.— Sam Shiels
- I used to believe that people were buried in "grates".— Grate Job
- Never point at a grave, if you do your finger will rot off.— KL.R