I can't think of one specific monent that really trumps the rest, but that game was just epic at the time. I hadn't seen anything like it and it was just insane.
It was really perfect in what it accomplished. I was just so taken back when I was kid, between that and arriving at Midgar (Not the rest of Final Fantasy 7, specifically MIDGAR), I was blown away by that generation. While I love SNES era style games, my favorite gaming moments truly do happen in that generation.