While my wife and I were waiting for our tour of the Imperial Tombs of China exhibit (it started with a film), a docent poked his head out of a room and called me over. He said that the First Presidency and several apostles were coming to the exhibit that night, and he asked if I could help him set up chairs for a special viewing of the film for them. I said sure.
We saw the film in the room with the GenPop, which ran about the same time the special film did. So we started the actual tour at the same time as President Hinckley, Thomas S. Monson, James E. Faust, and David B. Haight. I didn't see any other apostles, but I kept running into these 4.
President Faust came up to me, grabbed my arm, and very enthusiastically said, "How are you doing? Great to see you!" as if we were old friends. He didn't do that to other people. I was kind of taken aback, and my wife said, "How do you know him?" "I don't???" He did it again later too, "Hey, good to see you again! Are you enjoying the exhibit?" My wife didn't believe me for awhile that I really didn't know him.