I have a GREAT one!
At one interview, the admin building was kinda hard to find. Me and a few other suits found each other and started wandering together. Eventually, we got close to the place and a friendly young man approached us and said, "You here for the medical school interviews?" And then he gave us directions to the office. Nice young man.
About half an hour later, as the day was set to begin, the nice young man appeared again. "Are we all here?" he said. And everyone kind of mumbled, because how were we supposed to know? Then he said, "Why don't we start by going around the room and saying our names, and where we're from. You start," he said, pointing to some girl.
So we got about halfway into doing that and the Director of Admissions showed up. This schmuck was just another interviewee! Another guy actually blurted out, "So wait, you're not admissions staff?" It was super annoying. And he stayed super-annoying, trying to have personal conversations with the dean, the financial aid woman, the tour guides whoever. "Great tie, is that Polo?" It was like he had to make it clear that he was more like the AdCom than the other interviewees. I hate that guy. If he's in my MS1 class, I may vomit.