I used to go to SF cons, so I've me a bunch of folks, including Isacc Asimov (briefly - I hadn't any books with me so he signed my con badge).
At my first con, a couple friends and I ran into Robert Asprin as we were supposed to be leaving to get Pam home in time for her curfew. Since Pam was dressed as Tananda from the Myth Inc. series at the time, we stopped and chatted with him for about half an hour. We told Pam's mother that we were late because the car didn't start when it was time to leave. This was technically correct. We simply failed to mention that then only method by which we attempted to start the car at that point in time was telekinesis.
I've met a bunch of folks from Dr. Who, including four of the Doctors (Jon Pertwee, Tom Baker, Colin Baker and Sylvester McCoy) and several companions. In the late 80s I saw an amusing panel with actors from Robin of Sherwood. Michael Praed apparently got over his fear of flying by learning to be a piliot, but can only do it if he's flying the plane. He'd apparently flown himself to Chicago from the UK, arriving at some godawful hour of the morning, and the panel was at 9am. I have an amusing series of photos of him gradually looking more and more human as the pile of empty coffee cups in front of him grows. The conversation was largely held up by Mark Ryan (Nasir), which was entertaining since he almost never spoke on the show.
For photographic proof that I used to be an avid scarf-knitting Dr. Who fan, look here:
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www.geocities.com]
BTW, speaking of famous people, the woman in the group shots dressed as Colin Baker (the patchwork one) is now a published (and very good, in my not entirely biased opinion) sf author with 7 books to her name. Her name is Sarah Zettel, and I highly recommend her books if they're available over there. (Okay, I haven't read her more recent fantasy stuff yet, but I'm sure it's good too). When I first knew her she was working as a technical writer and writing fan fiction and short stories. I still remember watching her jump up and down when she had her first short story accepted by Analog.
I particularly recommend "Fool's War" and "Playing God".
Oh, and I have met one other famous person you may have heard of. Some chap from Wales by the name of Fforde.
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"I've often said that the difference between British and American SF TV series is that the British ones have three-dimensional characters and cardboard spaceships, while the Americans do it the other way around."
--Ross Smith