I was told in my freshman year of high school that it was not possible to have an erection and also urinate. For quite a while I was very proud of my penis size, knowing full well that if I was able to pee... it wasn't at its full length.
A childhood belief about weeing and pooing

others believed things like this
- I used to believe that the sky was full of dead people and I would see them if I went high enough— Maria
- I used to believe you got high tides when the sea was full (I lived on the Thames, then) — rosy
- When I was a child, I used to believe that the school attic was full of ghosts and elfs.— Lia
- I used to believe that all the first names of judges was Justice till I was doing my 4th high school year.— Tafadzwa
- The moon is full of wotsits.Anon
- I used to believe that the full moon was God's flashlight.Anon