8.

"When I was about 16, a friend asked our Chemistry teacher if she could use the bathroom. He kept refusing, until she eventually said she thought she’d come on her period and needed to put a tampon in. He still refused and demanded to know why she hadn’t put a tampon in before class, saying that she was old enough to know when she’d come on by now. According to him, a woman’s period came on the exact same day, at the same time each month. It blows my mind that this guy was a *science* teacher."

– Notmytree