I used to think masterbation (i think I spelled that right) was the same thing as a period...so I used the word masterbate a few times instead of period, no one ever corrected me
I didn't find out I was wrong until i was 12...man was I embarassed because I said "I mastrabated last week." everyone made fun of me because of that.
A childhood belief about periods

others believed things like this
- My mom told my sister that if she didn't eat her peas, her period would last for an entire month.— Maya
- in grade school, i used to believe that test tube was a naughty word and was embarassed to say it.— miss sara
- I used to believe the word shoes was spelled shouse. It looked right to me... — Shouse
- I used to believe that you had to be on your period to get pregnant........— Tricia
- HA! I used to think when you got your period, you would just pee blood...I wish it was like that...if only.Anon
- i used to think that had to wear diapers when you were on your period— Jess