not sure the definition of famous person, but to me it would be someone who the general public would know. with that in mind:
mark mcguire--almost hit my sister with his red corvette in '89 as we were walking out of the A's game. we talked for a few min, i was in 2nd grade.
bobby knight--met him during an A's game. signed an autograph for me, was pretty cool too. after that, he was rushed by people, and security escorted them away...i was the only person during the game to get the autograph.
have friends in the NFL (sprinters from my track team), but they're not widely known.)
i know there's more, just cant think of any.
my dad met chuck norris about 10 years ago in a book store, and they talked for a long time.
my mom went to HS and was friends with Tom Hanks (skyline HS, in oakland, ca).