I've a picture of Blair Underwood, who spoke at the CMU c/o 2000 graduation ceremony. He was walking near me, and I was on the stands. I shouted "hey", he smiled, and I took a picture of him.
Also, I was in the elevator with Robert Horry, who used to play with the Lakers, Spurs, and Rockets. I was on my way to my office and I couldn't believe it. I didn't get a chance to say anything to him b/c my office was only one flight up.
Back to when I was at CMU, I took a picture of Michael Douglas paparazzi style. He was on campus filming Wonder Boys, and I happened to come out of the photography studio in the basement, taking pictures of my design projects. I took a picture of the actor rehearsing a scene, and I was shooed away by the crew.