I know about one of my ex's fraternity stuff...he told me one time, I really don't know why. I didn't tell him a darn thing. I supposedly know another sororities grip, but I doubt it's really right. One of our older members told me because her cousin was in this org, but I don't know if that is really it.
Kinda sad that so many people just spill the beans on their orgs under the influence.