Out of all the mythical moments in the last 5 seasons, some of them stand out as classic Lost mateiral. I will do my best to list the classic scenes which, according to me, reprsent the show.
Wake up, Jack
The first scene, of the first episode, of the first season of Lost - Jack waking up in the jungle, not knowing where he is. The entire scene unfolds during the rest of the episodes - why does he have two vodka bottles? Why is he cut? And who was that dog?!
It's a polar bear. Wait - WHAT?!
This is our survivors' first encounter with a living Island creatire - not including the Monster. This scene's editing, along with Josh Holloway's intense acting, makes this one of the most memorable scenes from the entire seires. This scene will be referenced more than once during the run of the show, being a running gag and a reminder for the survivors that they are not the only hungry beings residing on this rock.
It don't matter if you're black or white.
John Locke's first test on the Island since he regained the ability to walk - facing the Monster, or as he described it, "the eye of this island", and what he saw - oh boy, that was beautiful. Two seasons later, Locke mentions that what he saw was a white light, while we got to know Mr. Smoker as a black cloud. Mistake? I don't think so. This scene has to be one of the most important scenes in John Locke's journey, as it launched his journey as a man of faith on a whole new level.