The Last of Us.
I didn't even want to play it, actually.
I was thinking it was just another RE like game and didn't bother to check it at all.
Then a friend that bought it on launch after finishing it was insisting on another friend to play it (we 3 would share our games to each other) and then lent him it but he wouldn't play because he was playing something else, then he lent it to me instead and I ended up accepting it just to get over it quickly.
My jaw dropped as soon as I started it, but I was still wanting to rush it and not giving it the proper treatment, but as soon as we got Ellie the game completely grabbed me and it turned to be the best game I ever played since LoD.