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I believe i n this theory: https://www.reddit.com/r/OnePiece/comments/8hap0s/theory_the_one_piece_is_pangea/.
This is an interesting take! I guess it resembles the "One Piece is the last Ancient Weapon" theories. I personally think it might be something else.
Oda stated that when he wrote Romance Dawn, he knew how the One Piece story would start and how the One Piece story would end, and that he had never changed his decision on that. Also, nobody he knew of had already guessed what the ending would be. It seems a bit much to me that he would have the entire plan of the Ancient Weapons already when he wrote Romance Dawn. Of course, this is an assumption, but there's just too much that happened during the past 20+ years that he had never thought of at the beginning, including stuff like the Shichibukai; let alone some more obscure mid- to end-story plots. I could be wrong with this of course, but that's how I feel!
Roger laughing about what he saw on Laugh Tale also indicates to me that the One Piece is something else than a weapon. It has to be something unexpected. Some info or some item that shows the irony of the world, or the irony of the pirate age.
I can't wait to find out the truth, and it's what's been keeping me hooked since the very beginning.
I think Roger was laughing because he realized that OP was a device to bring all the islands together but the device no longer works. So there is no way to unite all the lands. All his effort to get to OP was pointless hence the laughter. Once Luffy realizes the same he will use one of the Ancient Weapons to destroy the Grand Line and merge all the seas. So while an OP landmass never happened, an OP sea will happen.
Subverting expectations. :