I would be funny if Luffy is actually still in the barrel from chapter 2, delirious from hunger and thirst, making up an outrageous story about him being so awesome that everyone loves him, being able to beat super strong people all over the grand line, having the king's haki that impresses the most powerfull people in the world.. I mean seriously, who would believe that sort of crap? So in the final chapter of OP, Luffy is rescued by a fisherman, he gets beaten up by a total fodder pirate (who steals his strawhat) and goes home to write a manga.
That'd be epic, but without the meta crap of him writing a manga…