This is actually something my little brother thought when he was 5 or 6 - He had need pads and tampons in the bathroom at home, but was too embarassed to ask my mom what they were for. He thought that when a girl reached a certain age that she couldn't control her bladder anymore, and that's what all that stuff was for. My brother thought this for YEARS until he found out otherwise!
A childhood belief about periods

others believed things like this
- i used to belief that tampons were rolled up pads in a tubeAnon
- I used to believe that tampons were diapers for girls because they can't control when they pee...— Tien
- i thought 'locus of control" was spelled as "locust of control".. like the bugAnon
- my brother used to think a serial killer was someone that put nails and stuff in your cereal. lol :)Anon
- I used to think that tampons were meant to absorb women's urine so they wouldn't have to go to the bathroom.— Koyaanisqatsi
- I used to think that Cain and Able were brother and sister (with Able being the girl).— Duh