This one was totally random...
My husband and I had just moved to a new town, and we were looking for a synagogue to join. One synagogue not far from us had "new member tea's" every so often, and we decided to go to one. There were 3 or 4 potential new member families (just the adults) and the rabbi, president, and a couple of other officers, including the head of membership. So I find myself talking to the membership head, and she mentioned that her day job was being VP of membership for a national sorority.
"Oh, which one?" I asked.
"Alpha Epsilon Phi."
After I picked my jaw up off the floor, I told her that I'm an AEPhi too, and we had a good chat while my husband looked confused.
She mentioned that she hardly ever mentioned her sorority position outside of sorority business - she wasn't wearing her badge or anything. *shrug*
Come to think of it, that's the only time I've met a sister (and known it) outside of sorority-related events.