The only think I saw ME in before Lost was in Saw, and he was brilliant in it! He's such a great actor in whatever role he takes on, and always seems to be so intense and all encompassing of his characters.
TSG TV: Video Clips From The Smoking Gun
(If learning how to handle psycho prisoners isn't your thing, just fast forward to 6.10 instead)
'The Practice'
(After seeing this clip a while ago I still need to get round to watching this show someday!)