I haven't met many celebs, but those i have met:
Elizabeth Sladen - when we met her at a convention in Beccles she was extremely kind, talkative, happy, and posed for pictures and signed autographs. She was a very nice lady.
Craig Charles - i was lucky enough to win dinner with him and the crew of Robot Wars back in the day it was on, and i have to say, he is also a really nice guy. he never talked about himself, except when we asked questions, and was interested in what we had to say.
Boys From Liberty X (Tony & Kevin) - i was lucky enough to have a go-kart race with these boys at Pleasurewood Hills (my local theme park) for a segment on a CITV show. They were very nice, posed for photos and were even signing their own songs while driving round the track! They played a concert after. The boys were really nice, but when we saw the girls (Kerri, Jessica & Michelle) and asked for a picture they completely ignored us and carried on walking. Not very pleasureable.
Gareth David Lloyd (Torchwood) - wasn't very talkative, quiet and wasn't keen on signing loads of autographs. Seemed sidetracked and not bothered.
Lil' Chris - amazing!!! He was at his home town of Lowestoft, signing in Woolworths when it was open. He signed all of my Lil Chris cds (i had about seven) and even posed for three or four different photos. Great guy. My mate's mum also had dinner with him and said he was very nice and kind, and was not at all up himself.
Terry Molloy (Davros from Doctor Who) - was alright but seemed very bored also.
Stephen Mulhern - met him at Pleasurewood Hills when Liberty X was there, he was the presenter of the show which the go-kart race featured on and was a fab guy. He showed us some of his magic skills, posed for photos and was a generally amazing guy.
That's about it!