I only have one: jane Seymour. I've told the story before on ehell.
When I was 17 I worked in a high-end antique store in my hometown (tourist town). We were used to getting super rich people in the store - not me, I was a poor townie - so we had had our fill of attitude.
A petite lady comes in, accompanied by a few huge guys. They looked like linebackers. I greeted her, she was standoffish, but a lot of customers were like that. Finally she said: "Do you know who I am?" I didn't; I'd seen her movies but didn't recognize her in person.
She said she was making "Somewhere in Time" with Christopher Reeves and had the day off and wanted to shop. Of course at that name I went ga-ga.
Then she was very nice and friendly. I guess treating her as I did anyone else changed her attitude? I got her autograph. And she bought an antique silver pocketwatch that Reeves supposedly used in the movie; it would have been perfect for that era.
And, although I didn't get an autograph, I saw Richard Thomas (John Boy) in Manhattan several months ago. It was definitely him. He was shorter/thinner than I thought he'd be. I didn't speak to him; it was just a sighting.