You know the hole at the top of the sink to prevent overflow, I thought there was a monster down there and always tried to pour water down it to drown the monster.
A childhood belief about monsters

others believed things like this
- i used to believe that a monster lived in the garbage disposal. i would never go near the sink— Whitney
- 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
- i used to be scared of under my bed and thought that my cat became a monster only at night.— sumayah
- I used to believe that when you went poop a monster would eat it— Confused till age 7 now 11
- I used to believe that a monster would crawl out of the bath tub and eat me— Alex