I believed that fireflies were fairies. This belief became even more true for me after watching Ferngully, where all the fairies when they flew, left behind a colored glow. On top of that I never say a firefly up close so I never knew it was a bug until many years afterwards. So I stuck to my story for a good few years!
A childhood belief about fairies

others believed things like this
- I believed that fairies lived in lamp posts - their front doors were the little holes where the key fits.— Janice
- i used to believe that butterflies are fairies that crossed the rainbow— sillyme
- When I was a sprog, I used to think that Rainbows were painted in the sky by magic fairies— Jojo
- Well,I really think that fairies and witches can be real! We're in a big universe and they can exist!— Raul
- When I was a child I used to belive that fairies were born from the flowers.— fantasy
- I used to believe that princesses were make-believe like monsters, dragons, and fairies.Anon