i used to believe that if you held on to your pee you would get your period. I was told this when i was 10 and i held on to my pee so much one day i couldnt hold it anymore and i peed on myself in the street.
A childhood belief about periods

others believed things like this
- i thought that if you held in your fart you burp if you happen to hold both in you explode!— ahh!
- my mom told me that if i held in too many farts, i would explode. i took it seriously.— ginger
- I once told a friend of mine that if you held in a smelly burp, it'd turn into a fart. She believed me.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