Most of the famous people I've met are boring politicians from the '90s. Highlights: shaking hands with Bill Clinton once during each of his two campaigns (I was a volunteer motorcade driver during his campaign trip to Phoenix in 1996; I had his press secretary and personal physician in my van -- I bet they both had some good stories, but I didn't ask), and having cocktails with Janet Napolitano (before she embarked on her political career).
As you might expect, Phoenix, Arizona, is not exactly a hotbed of Hollywood celebrity sightings. We saw Tom Hanks at a Morton's once. That's all I got. But I'm not exactly vigilant when it comes to celeb-spotting.
However, in college I attended a master class led by David Raksin (look him up) and once tussled over the playlist at a party with Barry Bonds. (When I tell this story to friends, I make it sound like I and the future single-season homerun king actually came to blows; it was actually more of an amusing misunderstanding.)