I, too, used to believe the things in my room (both in the closet and under the bed--mainly skeletons, 'cuz I was terrified of skeletons) would attack me in the dark. I had to cover every bit of me and I couldn't sleep on my back because I didn't want to see the terrors coming to get me!
A childhood belief about under my bed

others believed things like this
- I used to believe the living room furniture would party after we all went to sleep.— Ellen
- I used to believe when I was 5 that I was special because I couldn't get to sleep until 11pm at night — Carrie
- I used to believe that when we left a room the TV set started to speak about other things — Nur
- When I was a child I used to believe that the things in my room became smaller but it was me who was growingAnon
- I used to think when I peed in the shower as a kid, the water coming back through the showerhead was my pee.— gregg
- I used to believe that echos were actually the sound going completely around the world and coming back to you.— kyle