I thought that since boys sat down when they went #2 and stood up when they went #1, and since girls sat down for #1, they had to poo standing up because it just all made sense when I was little.
A childhood belief about weeing and pooing

others believed things like this
- I thought that the difference between girls and boys was that girls have teeth.
Anon - When I was little, I thought that since boys stood up to pee, they could stand up to poop.— Lacey
- I used to think it was possible for girls to pee standing up. I even tried.Anon
- I always thought when I was a kid that Milo is for boys and that milk are for girls. . . — Cathyia
- i thought cats were girls and dogs were boys. Anon
- I always thought cats were all girls & dogs were all boys ... I have no idea why.Anon