When I was little I didn't realize that pee and blood came out of two different holes. I was so confused about how you were supposed to pee when you had a tampon in. I asked my mom and she cleared it all up for me.
A childhood belief about periods

others believed things like this
- when I was young, I heard that blood had iron in it. I thought blood was red because it was rusty.— Hunter
- I used to think my grandmother had two, shall we say, back ends. I didn't realize the second one was cleavage.Anon
- I didn't understand about boiled eggs until my Mum explained I wasn't supposed to eat the shell as well.— Chris
- I didn't know whether nail files were supposed to make your nails sharper or duller.Anon
- My father used to call soya sauce "monkey blood". I didn't even consider tasting it for years!— Me
- I used to believe that guns shot out blood because everytime somebody shot a gun in a movie you saw blood.Anon