My only encounter with Nichelle Nichols involved standing in line to get a few autographs from Star Trek actors at a comic book convention. I put the Star Trek Compendium in front of her to sign. She then proceeded to go on a five-minute rant about the cover (it featured Shatner and Nimoy and no one else). It was completely entertaining as she aired a whole bunch of dirty laundry for anyone to hear. She then passed the book along the table sans autograph and flashed me a tremendous smile.
Shellshocked, I just moved on. I never did get her autograph, but I did get a hell of a story.