I met JFK Jr once. I didn't realize it was him--he was sitting next to Darryl Hannah at a bar in which I was a regular. I was eager to get her autograph for a friend who had a major crush on her. I didn't have the nerve to ask her, so I figured I'd go through the Nobody she was sitting next to. Found out the next day that "Nobody" was John Kennedy Jr.
He couldn't have been nicer about turning my request down, I must say. I was selfish and young; today I would never approach someone like that who was clearly (as JFK Jr pointed out to me) just out to have a drink with friends.