I used to think (until age 14) that when you had your period, the blood came from your boobs. That's why, when you were old, your boobs would "sink" to the ground (because they lost so much blood!). Thank goodness for metapause!
A childhood belief about periods

others believed things like this
- I used to beleive that a period was when your boobs grew— sarah
- HA! I used to think when you got your period, you would just pee blood...I wish it was like that...if only.Anon
- 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 believe period blood came from the nipples. I thought that was what "padded bras" were for!!Anon
- For some reason i used to think that condom was another name for your boobs! — Claire
- WHEN I WAS LITTLE I USED TO THINK THAT GIRLS GET BOOBS BY ONE DAY GOING TO SLEEP AND IT JUST HAPPENS— J.C