When we were much younger, my sister used to believe that there was a monster living on the stairs and it's plan was to grab her ass and pull her into his evil pit so she used to run, full speed, up the stairs, firmly holding onto her ass, yelling "HOLD YOUR BUM!"...
Everytime for about three years. I must admit, for a while I did take her advice...
A childhood belief about monsters

others believed things like this
- I used to believe that it was the law to hold the railing when you're walking down/up stairs— Brit
- I would turn the lights off and then leg it up the stairs thinking a monster would be chasing me.Anon
- 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 I could fly.
All I had todo was step of a flight of stairs and I'd be walking in the air...— Dolly