You have no idea what I'm capable of

So my brother-in-law Josh doesn't know me that well. It's probably because we haven't talked that much. Josh thinks I'm this quiet, conservative person. So he was shocked yesterday when Steph (his wife), Jared, and I were talking about different excursions for our cruise. Steph brought up sharks and that she's terrified of them; Josh said they weren't a big deal. So I responded with something like, "Yeah well, you'd be a lot more scared if you were a girl and were on your period." Josh then said, "Wow, that's about the grossest thing I've ever heard . . . and it came from Megan." Oh how truly ignorant he is. I should think of things to say on the cruise that will totally freak him out. WOFYB ladies, and be proud of it.