I used to believe that everyone had a different colored brain and (of course) I was the only one who could assign them a color. It usually coressponded to their favorite color though. :)
A childhood belief about general

others believed things like this
- When I was younger, I used to think that people with different colored skin had different color poops.— Samuel
- I use to think polka dot was a color.Anon
- that red and orange were different shades of the same color— Larry
- Up until about six, I use to believe that everyone had a different color of pee and I was stuck with yellow.Anon
- I thought that to get married, your spouse had to have the same eye color as you did.Anon
- I was once told that white roaches where that color because they just got married.— Andrew