I used to believe No-Heart (From the Care Bears) lived behind my shower curtains. I was really afraid to get up at night and would have someone check the curtains before I pee
A childhood belief about monsters

others believed things like this
- I used to believe that the actors in movies were all acting live behind those big curtains in the cinema.— Courtney
- I used to think that gummy bears were evil and wanted to take over the world. I'm afraid of them to this day.Anon
- I used to think that a family of evil bears lived in my grandparent's attic.— jasonchic
- When I was a child I used to believe that teddy bears could talk to me at night.— Daiana
- I used to think that Shamu was my whale and that he just lived at Sea World and they took care of him for me.Anon
- I used to think that trolls lived in my shower drain and showered with my dirty water— Troll bather