He played most notably for the Denver Nuggets.
He suffers from Tourette syndrome
He signed my basketball card 'Chris Jackson.'
He changed his name.
Here's a good interview with Mahmoud Abdul-Rauf regarding his NBA career - specifically what happened to it after it became known that he did not stand for the Star-Spangled Banner.
Back when I was a ball boy, he was always really nice to us kids - chatting, playing around, etc. I was sad to see his NBA career end the way it did.
(if you look carefully at the picture, you may recognize both of the big fellas)