We lived, when I was small, in an apartment that had an open crawl space under the stairs. I was terrified of this space, and I was convinced that unless I raced up and down the stairs as fast as I could, that giant spider monsters from under the stairs would jump out and get me. I tripped and fell up and down the stairs several times due to the reckless pace.
A childhood belief about monsters

others believed things like this
- I used to believe I could fly when I was about four, until I fell down the stairs.— Sarah
- I used to think you could die if you jumped half way down the stairs. Anon
- I used to believe that if I went down the stairs slowly a red eyed skeleton would come and run after me.— Melly2bee
- I used to believe that it was the law to hold the railing when you're walking down/up stairs— Brit
- I used to believe I could fly.
All I had todo was step of a flight of stairs and I'd be walking in the air...— Dolly - I used to believe that if I stood at the top of the stairs, closed my eyes and yawned, I flew down them— Sam