One of my coworkers was wearing a shirt that said “BIRK CLUB.” Complete with the soap icon.

It was referring to BirkBall. Apparently they used to play this a lot at his grad school.

NOAH: I’d tell you more but… it’s really geeky.

VINEET: The first rule of Birk Club is: Do not talk about Birk Club.

Web link of note: Birkball