When I was a kid I thought girls' urine was blue (I am obviously male).
A childhood belief about weeing and pooing

others believed things like this
- I thought the word mailman was male man and it seemed dumb to me as aren't all men male?— andalite
- I alwaysused to think white cats were girls, and black cats were male ...— Smiley Face
- You know the eifel65 song "Im blue da be da ba di"
I thought he said "I'm blue I'm in need of a guy"— Anna - When I was little I thought that my urine was stored in my scrotum until I needed to wee.— Bryan
- Eifel 65 - Blue
I'm Blue (if I was green I would die...)
[I'm blue, da ba dee, da ba di.]— Matt - I used to think that to desex an animal meant to turn it from a male to a female or female to male.— Phil