What Hooked You on Lost?

I managed to make two Lost converts so far this summer.

Out of curiousity I asked one of them what was the thing that really hooked him. He said that one of the many things was the episode where we get the first part of the story about Sawyer and his letter.

So I have a question for any of you Lost fanatics who may have stumbled across this (or found it deliberately)----- What was the scene that hooked you? When did you realize that this was one of the greatest shows EVER?