Faux pas part eleventytwo

A coworker and I are watching TV in the office, making catty remarks about the guests on the show. It's some sort of panel made up of women experts talking about the latest social evils to plague Vietnamese society.

Co-worker: She's not cute. Permanent bitchface.

Me: Yup, not cute.

Co-worker: Oh, look at her face, that one got plastic surgery.

Me: Freaky, her nose is like Michael Jackson's.

And so it goes, and I'm feeling good because we're just chatting like normal workbuddies stuck on the late shift.

Me: Oh, she is definitely not cute. Uggggg-ly!

Co-worker: *deadpan*...she's my sister.

Me: Waaaa?!? Really?

Co-worker: No, no, haha!

Me: Oh, haha, phew! You made me so scared!

Co-worker: By marriage. She's my...*switches to English* ...sister in law?

Me: Oh...um, yeah, that's right. That would be a sister-in-law.