These are two that John D. MacDonald wrote about. One was the child that overheard his father talking about an obviously fearsome monster: the twi-night double-header.
The other was a child frightened of the Green Ripper. Her parents finally figured out that she'd mis-understood "grim reaper."
And me, I brought all my childhood beliefs into adulthood.
A childhood belief about monsters

others believed things like this
- i used to think that i was a werewolf and that at night i played poker with the grim reaper— mike
- As a child I used to think that Olivia Newton-John and Elton John were married.
Boy, I was way off.— Lisa - As a child, I thought that Olivia Newton-John was Elton John's wife and Juice Newton's sister.— Connie
- When I was a child I used to believe that my parents WERE superheroes at night.
Anon - When I was a child I used to believe children were being brought by stork.— Matteo
- When i was child, i used to think my father was my father christmas.— BeB's