We had an "interesting" Greek Advisor back in my day. (He's since resigned.)
Back when my sorority was a new local, there was a meeting for (I believe) parents of prospective students, focused on the greek system. Many fraternity and sorority presidents, including the president of my sorority, were there. At one point during the talk, the advisor said "There are four sororities at this school." My sorority's president cleared her throat very loudly. The advisor turned to her and said "... oh yeah, and you guys." He did *not* correct himself and say "sorry, five sororities" - he just proceeded with his speech.
That's just one of many examples...