I've met plenty of celebrities at conventions, cant think of any i know personally, although i have talked to Alan Tudyk and David Hewlett (and a few other less well known celebs) for quite some time at convention VIP party's. I think they could probably remember me as the Halo guy
I stroke up a pretty long conversation with Doug Jones (the silver surfer) in the signing line once, about prosthetics and costumes, he does a LOT of work with them. Sadly i didn't have my armour on at the time, I'm hoping to meet him at another con some time and show him some of my handy work.
Das Brutus - I assume you now have a prosthetic hand, since your hand could not survive a handshake from chuck norris.