Definitely FFX for me. I was like uhh what... 9 yo at the time (now 21), I still remember how we drove to faraway city just because the person was selling his PS2 really cheap at the time along with some original games, FFX included. The same day I played like an hour or so of the game and I was literally speechless of the graphics, my parents had to force me to shut down the game so I could go to school the next day. Those were the times.