There's been a chapter of AEPi at my school for quite a few years.
I joined a local sorority. During my sophomore year, we became a colony, and later a chapter, of AEPhi.
Two of the stupid questions I got when wearing letters were, "Oh, you're an AEPi little sister?" and "Oh, when did AEPi go coed?"
You would think that at an engineering school, people would be able to tell the difference between the letters pi and phi.