I've "met" Wilford Brimley (Our House, Cocoon, Quaker Oatmeal guy) several times; I grew up near where he lived and he shopped at the same grocery store as us. He was a dick.
I used to work at a movie theater that was frequented by several Utah Jazz basketball players, I remember serving Jeff Hornacek, John Stockton, and Greg Ostertag popcorn
Also met Lyle Lovett, pre-Julia. It was at a bluegrass concert when I was a kid, probably 8 or 9. He and my dad talked for a long time; my dad said he was really nice. I don't really remember, I just wanted my dad to hurry up so he'd buy me an ice cream cone.
Thats about it.