I've been to 2 Farscape Cons and met most of the main cast.
Ben Browder (plays John Crichton) was great. And for those of you who watch the show, you will get this: I asked him to give me a shot at rock-paper-scissors. I was so darn thrilled that he smiled and put one hand in the air that I all remember was that I lost. I thanked him, told him to take care and that was pretty much that. But a very memorable moment.
An interesting follow-up was at the next con where I was able to meet Anthony Simcoe (plays D'argo). Let me just say that he is completely nuts, during the middle of a picture taking session during a post-Con cocktail party he got up, jumped in to the middle of the dance floor and started grinding with a large group of women. Anyhow, I digress....
I was going to get a picture taken with him, Gigi Edgley (plays Chiana) and Wayne Pygram (plays Scorpius). I guess Wayne Pygram got a bit dehyrated and had to step out for a few minutes so I got to BS with Anthony for a bit. To make a long story short I asked to get a quick picture of just he and I doing rock-paper-scissors. I told him he had to beat me and he insisted that D'argo always loses. I forgot about that. Needless to say, he did it and I was happy. Farscape rules.
I don't really count this but James Van Der Beek grew up near the electronics store I used to work at and stopped in from time to time. He had a very "don't bother me" attitude. But I didn't really care since I didn't really want to meet him to begin with. And I couldn't blame the guy, I'm sure he got pestered wherever he went because of his fame.
But meeting Ben Browder was tops on my list, he was just simply a ton of fun.
EDIT: And on a related note, I dated a girl (briefly) about 5 years back was who's sister (I believe she had many sisters) was married to Snoop Dog. I honestly didn't believe it at the time until she showed me the house they lived in. She always wore expensive and fancy clothes, too. But still, I never saw any pictures or got any proof so to this day I am still sceptical.