At one of my schools, there were three interviews, the first being with an MD. We quickly built a strong rapport, me asking questions about the university and talking about his research. The interview went so well, he actually said "well congratulat....I mean good luck" when I left. And this was the first of three! The second one was a bit rougher, it was with a member of the ADCOM, but he ended up saying "we don't get many students as well rounded as you." Finally, the student interview...she taught one of my Kaplan courses! She actually remembered me, and we had a nice conversation.
I haven't heard back yet, but I've got my fingers crossed! I really liked it there!