I'll start.
When I was 5 or so I asked my mom why girls sat down when they used the bathroom. She said it was so they can pee. When I asked about pooping, she jokingly said poop comes out the front for girls and pee comes out the back.
She never corrected her horrible mistake.
For years whenever I had diarrhea I would announce that I had to pee like a girl. And by years, I mean 9th grade.
And she still wonders why I'm gay.