As a child my world was filled with horror movies and Discovery channel shows, but i very muchly believed in monsters, i thought the lights in the woods were crazed satanists who were going to steal me from my bed and sacrifice me to bring some monster into the world (they later turned out to be a nearby house on the other side of the trees). Now, in my 20s... I believe in faeries. it is they who make my socks vanish when i do laundry, who strategically relocate car keys, term papers, my driver's license, and anything that they know i'll be loking for soon. Sometimes they intentionally remind me of something they've moved just to watch me spend a half hour tearing the room apart to find it. There are baseball-bat wielding Inspiration Fairies, metallic golden Desk Avalanche Gnomes carefully testing the strata of books, papers, toys, bubble wrap, and the like for instablities while making sure the stuff I actually need is on the top, sock-filchers and mysterious-undergarment-stain painters, and many more besides, and I don't want them to ever go away.
A childhood belief about fairies

others believed things like this
- When I was a kid my dad told me that in a package of socks there was a right sock and a left sock.— Christina
- I used to believe that fax machines worked by sending papers down underground tunnels. Anon
- I used to believe that moths circled lights at night trying to find a way out of the world!— Diane D.
- I used to think that robbers had keys to every house and that's how they got in to take your stuff— Emma
- I used to believe that princesses were make-believe like monsters, dragons, and fairies.Anon
- I used to think that a company had boats all over the world making waves, and airplanes making cloudsAnon