When my brother Mikey was about four years old, there was a tear in the curtains in his bedroom. The headlights from cars passing the house would shine through this irregular shape, onto the wall, and they would move across the room as the car moved past the house.
For a few weeks, Mikey would complain every night about the "Toothy Monsters" in his room, afraid that they would eat him. Finally our Mom saw the jagged light move across the wall and showed him what it was, and he wasn't so afraid anymore.
A childhood belief about monsters

others believed things like this
- i believed that if you farted too much in a room and you were to light a flame your house would blow up— the nuclear fart
- I used to believe that when you moved house you swapped house with the person moving into your old house.Anon
- when i was younger i thought that when you moved house your house moved with you!!— chrissy
- when i was young i believed that when u moved house the house would come with you !!!
just like a turtleAnon - I used to believe that it wasn't wind that made the tops of trees move.. It was dinosaurs.— H
- I used to believe that cars were alive and their headlights were eyes.— Wiley