I am an only child and when I was 5, I figured that I needed a sibling. My parents weren't supplying, so I put matters in my own hands and started having an imagenary friend, Max. After about a month of Max, my parents were getting worried about my health. I remember my mom asking me if I could actually see Max to which I replied, "MOM! He's imagenary!"
A childhood belief about imaginary friends

others believed things like this
- My parents have the same birthday -- month, day, and year. I though all mom's and dad's had the same birthday.— Cait
- that as I grew up, my parents would "grown down," then I would be the Mom and Mom would be my child.Anon
- 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 my parents were superheroes, like the fairly oddparents!Anon
- Ironically my parents were born on the same day; so growing up, I thought all parents had the same birthdays. Anon
- I used to think that if you met your parents' boss, your parents would be fired!! AAAAAHHHHHHH!!!— Spoot