A friend I met at University (ie he was 18! believed that you stored poo in your buttocks, and that after you went to the bathroom your bum was smaller. Hi Jim!
A childhood belief about weeing and pooing

others believed things like this
- I used to think that poop was stored in your buttocks and that's why they're squishy.Anon
- I used to believe pee was stored in your stomach and poo was stored in your back.— Rob
- I believed that all of my blood was stored in the calves of my legs. — Julia
- i used to believe that people's buttocks were plump because of the poo filled in it— Diesa
- Since my father had a deep cleft in his chin, I thought he was growing a tiny buttocks out of his face.— Rick
- i used to think that your butt cheeks is where your poop was stored. Anon