It's not my belief, but once I made another kid believe he was a ghost.
My Mom taught me about sex, and I asked him if his parents ever had sex. He said no, and I told him he couldn't exist then, so he must be a ghost.
I was a deep kid :p
A childhood belief about reproduction

others believed things like this
- I loved watching the cartoon Casper the Friendly Ghost and wondered why the Holy Ghost never got his own show.— Robert
- I thought the Holy Ghost was the ghost of the Virgin Mary.— Texas granny
- I used to think that the wind that made a howling noise was a ghost.— Febi
- i told my mother that sex was when two people get naked and tell ghost stories.— linds
- If I pretend to sleep the ghost won't eat me
Anon - I used to think that when I saw someone on TV whom I knew to be dead , it meant that it was his or her ghost.— Sophie