Best Flashback, Flashforward, or Flashsideways storyline?

I was just thinking about this, and was wondering what was my favorite flashback, flashforward, or flashsideways storyline from LOST? Mine would have to be John Locke's flashback in Deus Ex Machina. It was neat to see the relationship between John and his father blossom. And it really surprised me when I they showed that his father stole his kidney. The ending was just so powerful that it just made me love the episode! My close second would have to be Richard's flashback from Ab Aeterno. What are your picks?

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