Yeah, actually quite a few.....
Barbara Streisand when I was a little boy. She bot a collie from my mom's best friend. she wore daisy dukes and a tank top and was very friendly. Mid 60's time frame. I remember thinking she was pretty, but not much else...not that I knew who she was til I got older...
Jerry Seinfeld during the last season his show was on the air. He bought a Porsche at the dealership I worked at. He came in and talked to all of us. He was friendly, non-assuming, and a genuine nice guy. His agent was a slave driver...but I guess thats what he gets paid for lol
Lucy Lee Flippin (she is a character actor most known for being Eliza Jane Wilder on Little House on the Prairie. She bought a car from me. Very Very nice woman. Polite, Friendly. a genuine person.
Christopher McDonald (one of the roles hes best known for is Shooter McGavin on Happy Gilmore) ha bought an Audi through his agent, and needed some help calculating what he needed to write off on his taxes. Came by to see if someone could give him a hand. Talked to him a few times. Nice guy.
General Norman Schwarzkopf. Old Stormin Norman spoke at My BNCOC class in the army and had lunch with us. A good motivational speaker.

(for those whove had the pleasure of hearing him...

)
King Hussein of Jordan (may he rest in peace). I was in Jordan on a joint military excercise in the late 80's and had to do a presentation on some military hardware we were offering to sell to the Jordanian army. He was an intelligent man, with a ready smile. Kind hearted and easy going. Charismatic.
I also met Dave of 'Wendy's' fame. He gave me and a friend of mine coupons for free burgers at Wendy's.
Cullen G. Chambers, who's the stunt double for Samuel Jackson. Sold him a car as well. Great Guy.
Spike Feresten (writer for Sienfeld, Saturday Night Live, Dennis Miller etc...) bought an Audi from me.
Daniel J. Schneider who was the principal on the tv series 'Head of the Class'. I met him at an auto show in Los Angeles where he was talking to me about the VW Campers, we chatted for about a half an hour. nice guy.
Dale Jarrett (the nascar driver who won the winston cup a few years back)...I work for him now and see him about 3 times a month...lol Nice guy.
Steve Smith of The Carolina Panthers. Hes a jerk. wouldnt give us the time of day when he stopped at our dealership a few years ago. had the 'you're beneath me' attitude.
on the flip side
LaDainian Tomlinson of The Chargers (now probably Patroits if I remember my recent NFL news) Is a good guy. honest and sincere. met us fans and didnt give us any attitude.
These are the ones that stand out..but there are quite a few more.
My belief is to treat them as I would treat any other person. In fact, I go out of my way to not fawn over them. I treat them with respect and try not to be an annoying fan.