When I was a little girl I would mimick my mother by "nursing" my baby dolls. I held a very firm belief that one of my child sized breasts held orange juice and the other one held milk.
A childhood belief about rude bits

others believed things like this
- I used to think that women wore bra's because it held the milk in. :)— Stephanie
- My sister use to belive the reason mom had two breasts - one to give milk, the other for juice.
Anon - I used to think that testes held your pee.— sehawk18
- When I was young I used to think my testicles held the pee!Anon
- I used to think that planes were held up by stringsAnon
- I used to believe that if you had to fart and held it in too long that it would cause you to blow upAnon