When I was about six I was helping my mum change her bed and found what I realised much later was a sanitary towel (clean of course!). My mum (either from embarrassment or a twisted sense of humour) told me it was a magic carpet that the tooth fairy had flown in on the previous night, as i'd lost a tooth the day before). After pondering this for a few days I asked why she'd left her carpet and how she managed to fly out again. "Magic" was my mum's less imaginative reply! For years I believed that this was true, and only realised what I'd found when I was a teenager.
A childhood belief about fairies

others believed things like this
- i used to think that my sister was a genie and flew a magic carpet at nightAnon
- I believed a star that I later found out was the planet Venus was the Tooth Fairy— Jillybean
- I used to believe the the tooth fairy was a Pokemon fan because she got me Pokemon Crystal for my lost tooth— Pokemon fan
- I used to think that the tooth fairy puts you in a deep sleep before stealing your tooth/teeth.Anon
- I used to believe that in the tooth fairy took all your teeth and built a tooth city for her to live in!Anon
- when i was a child i used to believe if i put my tooth under the bed the tooth fairy would give me money— milena