When I was little, my brother and I both believed that "fat" people were like that because they never went "potty". This belief was reconsidered at age 8.
A childhood belief about weeing and pooing

others believed things like this
- My brother used to be scared to poop in the potty. He thought that he was pooping out his bones.— Lillyth
- I used to think people had a "potty mouth" if they had been drinking out of the toilet.Anon
- I always believed that my dad went to school with Billy Bunter. I think my brother believed it too!— Karen
- that bathroom tap water was recycled "potty" water from the toliet. — livingdeadgirl
- When my brother was little, he believed that girls peed out of their boobs.— Emily
- First I believed that my parents were brother and sister. Then I thought that my dad was also my mums dad. — Rainbow