what if it turns out there's a huge gameplay twist? Like they're walking through a destroyed city and turn a corner, only to find everything is dusty and desert-looking, with men with guns and cloth wrapped around their faces are everywhere. Then a truck runs Joel and Ellie from behind, killing them. A bunch of guys are riding on the truck and the camera focuses in on one of them-- it's Solid Snake and this is the opening cut scene to MGS4!!!! Then it turns out that the rest of the game is just the same old MGS4 we played before with nothing added and you never revisit the Last of Us storyline. When you beat MGS4, it changes the title screen to MGS4 and locks you out of ever playing the Last of Us segment again. For all intents and purposes your disc has a Last of Us label, but is actually MGS4. Gamestop trade-in value will reflect as such.
Then it turns out if you press up, up, down, down, left, right, left, right, B, A, start on the title screen, the game turns into Ground Zeroes and the whole thing was a Kojima scam.