I used to watch my brother and other little boys go to the bathroom when we were little, and I was convinced that the reason boys held their penises while they were doing it was because they needed to squeeze the pee out-- like it was a water squeeze bottle or something. I was very glad to be a girl so I didn't have to do that. (So much for penis envy, I guess.)
A childhood belief about rude bits

others believed things like this
- I used to think that boys didn't get their penis until they were 18 which was legal adulthood! — beckles
- I used to think that hot dogs were made from boys' penises.— never eating hot dogs again
- When I was about six, I believed that boys had buttons on their penises--one for pee and the other for poop.Anon
- I used to believe both boys and girls had penises so i thought sex was when they tied them together.Anon
- I used to believe that condoms were weared by girls and boys
both. And they both have penisAnon - I never knew why boys had to lift up the toilet seat...until my friend told me that boys had bad aim.Anon