I don't think this is very unusual cause I know lots of other people used to do this but I used to believe that there was a monster under my bed that would grab my feet when I got on and off the bed... so I used to run and jump onto my bed and then when I had to get off I'd make sure to leap far away from the bed.
A childhood belief about under my bed

others believed things like this
- I used to believe that people born on leap year would only age once every 4 yearsAnon
- I used to think people with lots of freckles were playing with crayons and drew dots on their face.— WOW
- I ues to believe that if I broke th TV the people would jump out and try to catch me.— Lazyj (K)
- I thought the boogey monster was a monster that ate boogers at night in front of youAnon
- I Used To Believe The Monster Beverage/Energy Drink Was Monster Milk!— KellGirl
- When I got my feet measured by the electronic machine, I thought that the machine will squash my feet!— Helen