This is one i haven't and wont grow out of... I still believe my childhood "imaginary friend" (an old man, in overalls and bowler hat) was actually the spirit of my great grandfather. ( I was describing him to my father and he told me thats exactly what my great-grampa looked like.)
A childhood belief about imaginary friends

others believed things like this
- My great-grandfather firmly believed, and had me convinced, that SPAM was mouse meat. — texasblue
- When I was little I used to believe that God looked like the Great Gazoo (the alien from "The Flintstones").— Susan
- I used to let go all my balloons so my great grandma would get it in heaven— lissa
- "God is good, God is great, lettuce thank him for our food Amen"— pj
- I used to think that the word Great was added to Britain because they won the Second World War.— Age
- I used to think that Hadrian also built the Great Wall of China.— Spacey