*Semi-spoilers*
Luffy, Ace and Sabo flashback, the one after the Marineford arc. Becomming brothers. With the Dadan family and all. Though I guess if you're that uninterested in flashbacks you might not enjoy it that much. You should still try though.
The big spoiler during Marineford was made very touching in the anime too, and Luffy on Amazon Lily was made even more interesting.
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Easiest bracket ever, yet we all failed!
Well except SuperNiceDog, of course!