Well, my list is 99% good, aside from a few bloops, so I guess I'm just lucky!
George Takei: Just plain amazing. Helped my girlfriend out of her wheelchair due to her broken foot, even though I was doing doing just fine. He was polite, engaging and very talkative!
Michael Ironside: Really polite and very happy to talk in depth about his past work. An awesome guy.
John-Rhys Davies: Really funny and polite too, asked what had happened to my girlfriend's foot and then suggested I'd thrown her down the stairs! He's laugh is incredible too. Class act.
Robert Englund: Really took the time to talk to us and make us feel special. Really great guy.
Robert Llewellyn: Very polite and funny guy. Cares about his liberal views and loves to discuss his Prius!
Edward Furlong: Seemed to be a little bit dazed but loved having his photo taken with my GF and made a real effort to make her happy! Nice guy.
Billy Dee Williams: Full of smiles and nice enough, although he seemed to be slightly 'off', as if he was ill or something. Still took the time to have photos taken though!
Katee Sackhoff: Amazingly polite and charming. Took the time to ask me if there were any questions I wanted to ask!
William Shatner: Full tactical security deployment around him and a hurried queue, but he was still polite and friendly to us both. Seemed like a really nice guy.
Russel Tovey: I went to school with him and he brought up that he remembered me, which was awesome as I didn't want to say anything through fear of looking like an idiot. Still a really nice guy.
Keely Hawes: Stunning looking girl and super-polite. Took the time to answer all the questions we had for her!
Tom Hanks: Really nice guy. Simple as that.
Jeremy Clarkson, Richard Hammond and James May: Jeremy ripped the **** out of me, in the politest way possible because my GF was the first woman to ever get 20/20 on the Top Gear Quiz when we went to see it being recorded. It was awesome. Richard Hammond apologised prefusely when he posed for a photo with us because my GF still had her broken foot. When she pointed out that it wasn't his fault he looked at me with a slight look of panic and said 'You never know around here! They're out to get us!'. James May appears to not know he's a celebrity and was just bumbling around being very, very English.
Jimmy Pop: My girlfriend went to see Bloodhound Gang at the Astoria. Whilst in the mosh a guy backflipped and kicked her square in the back of the head, knocking her out and giving her a concussion. Security dragged her out and took her backstage. Whilst they awaited an ambulance Jimmy Pop came over and apologised for what had happened. He then promptly vomited over her cleveage. This was due to his act moments before when he was drinking his own sick. He then got really upset that he'd done this ontop of what had already happened and made his runner go and get t-shirts, CDs, posters and his spare hat, got them all signed and gave them to my girlfriend as she was loaded into the ambulance. A really, really nice guy.
and finally:
Ronnie O'Sullivan: Was a jerk to my girlfriend and asked if she would sleep with him, as he was famous (as a joke, I would hope). When she said no he told her to **** off. Stay classy Ronnie.