Well, I have met a couple...

Bob Barker, who I had wanted to meet since I was a little kid watching the Price is Right
Stone Cold Steve Austin, so happened he stayed in the same hotel we did when we were in NYC. Met him outside the hotel waiting for his limo, he is really a cool bro.
Played against Steve "Air" McNair when I was in college.
Gambled in Vegas with Dennis Rodman before he got thrown out for rubbing the dice on his nutts after he was told to keep the dice over the table.
Met Hulk Hogan and Brutus the Barber Beefcake at a company function.
Met Steve Atwater also and had him autograph two of his football cards for me.
That's about it...