Dude, where to begin?
Mark McGwire - used to come into the family restaurant
Terry Steinbach - old catcher for the A's, also in the restaurant
Manute Bol - played for the Warriors - restaurant
Tim Hardaway - also played for the Warriors - restaurant
Chris Mullin - sold him some shoes when I was in High School
Ricky Williams - saw him at Disneyland
Robin Williams - saw him at the Metreon in SF
Warwick Davis (Willow!) - met him at Disneyland when I worked there
Paula Poundstone - crazy lady also at Disneyland
Larry King - also at Disneyland
Rob Reiner - also at Disneyland
Ty Pennington - walking down the street in SF
John Delancie (Q from Next Generation) - at a Trekkie convention in SF - this was a LOOOOONNNNGG time ago, way back in 1994
D.B. Sweeney - saw him at the Dodger game this year
That's about I can think of right now. I'm sure there's more, but I can't remember.