I don't know why I thought of this now (there must be a trigger here somewhere), but I am always amazed by my seat mates who tell me how much much they travel and share with me their travel/upgrade strategies, often telling me that they have top UA status, and then when I check the manifest, I find that they are a Premier or PremEx.

P.S. My employees tell me that I am a very unusual interviewer who asks surprising questions that elicit information they had no intention of sharing.