One day when i was a kid my mom was talking to my older sister about how she hated going to the doctor for her monthly exam. At this I piped up, "I know why you don't want to go to the doctor. Because he's gonna give you your period!" I was fully convinced that that was how it worked. Kind of makes sense right?
A childhood belief about periods

others believed things like this
- I used to think eating raw potatoes would give you "BEZORES".
Our family doctor told me this— Moodycop - I thought a major general is more powerful than just a general (which still kind of makes sense to me)— Demond
- I used to want to be a doctor when I grew up, because doctors never die, as they can cure themselves.— Stuart
I used to believe a man and a woman needed a doctor to put their parts together when they did it.— Phil- my uncle was a doctor, so when he told me his vw could fly, i believed.— boodles
- i used to watch doctor who and every time i saw a darlic i wet myself literally.— Dan Barber