I used to believe that my testicles were my kidneys. Made sense, right near where one pees from. Took me till fifth grade to sort it out.
A childhood belief about rude bits

others believed things like this
- I used to believe that kidneys were located in your knees.Anon
- I used to think that kidneys were where babies ('kids') came from. — Ri
- I used to think boys went "number two" with their pee pees. Anon
- I thought your loins were kidneys, and nobody corrected me until I was a teenagerAnon
- I used to think that people who donated their kidneys were doing it for steak and kidney pie.Anon
- I used to think the suction of an aeroplane toilet was large enough to suck your kidneys and spleen out.— Big Chrissy S_ _ _ _ _