We sat next to The Office's "Roy" at The Greenbrier. He was sitting with 2 agent/manager types and they blew smoke up his ass for the entire dinner about how big a star he was, etc. Pitiful.
This summer, I rode in an elevator with Keifer Sutherland in a hotel. He was talking to his woman friend about a hotel worker who clearly loved his job, very complimentary. He was dressed very nicely, and shorter than me (I'm 5'8") He gave me a sweet smile in the lobby area. I think he's a good one.
Saw Diana Ross at an fancy event a few years ago. As the lunch was breaking up and people were leaving, she was ranting & raving about something to her assistant, loudly. It was so awkward and I was embarrassed for her (and the assistant). Paul McCartney was at the same event and couldn't have been more gracious, including taking photos with fans, even though NOBODY was doing that in the room.