My claims to fame in this area aren't very "famous" ...
During my freshman year, at Trees I played in a game when George Allen played for about half the game. George was still enrolled at Pitt even though he wasn't eligible.
Before my Soph year, when Jerome Lane was a frosh, I had "next" for a game when Jerome Lane was playing. He too only played about half the game but made a play I'll never forget. He drove the baseline, and rose to the hoop and we all thought he was going to slam, but instead he went under the hoop and we thought we'd see a cool reverse layup. But he kept on going and turned it into an up and under slam. The sound it made as it echoed in the gym was awesome.
As a Junior and Senior, I also played in couple of games where Scotty Columbo played.