When I was really young I was convinced that I had a huge pet grizzly bear (and a wolf but that's another story).
I told everyone that would listen all about the bear (that lived in a tall shed on top of the hill near my house).
When they asked I'd show them the bear by holding out one hand and pointing into the palm of that hand with the other hand saying 'look, it's there, in my hand'.
Even I don't understand.
A childhood belief about imaginary friends

others believed things like this
- I used to think that my right hand wasn't my right hand anymore if I turned around.— Mike
- when I was little my uncle told me he was part bear. I believed people could be part bear until I was twelve. — Audrey
- when i was 6 my mom told me that if you bit your nails a hand would grow in your stomachAnon
- I used to hold my hand over my hair whenever i left the house and it was windy incase my hair blew away— lisa
- I used to believe that I could actually cut the clouds with my hand.Anon
- I used to believe that if you put your hand in a venus fly trap it would eat it.Anon