I have had a conversation with Chucky Atkins when he played for the Celtics a couple years ago. He was a real cool guy, very nice. We talked for a couple minutes, actually. He asked me where I was from, if I played or not, what position I played, etc. Unfortunately, I did not have a pen or marker on me, so I couldn't get his autograph, but it was awesome talking to him.
Also, Delonte West has said a couple words to me lol. This doesn't count as a conversation, but I had floor seats, and he was dribbling a ball close to where we were, so I screamed "DELONTE!" He turned, looked at me, said "hey." Then I held out a pen and a peice of paper, and he said "after the game, bro."