You are correct, the Mets were down to the final out and had two strikes in Game 6 of the 1986 Series, before the passed ball and the Bill Buckner goof allowed the Mets to win the game. Worst night of my life. Although many forget that was only Game 6 - the Sox had another chance to win the Series, and were actually ahead in Game 7 too, but lost. That was the night of my second wedding anniversary, and it was miserable.
It was worse than that. The Mets were down to their final strike with no one on base. The Mets started their entire rally with no one on and two outs.
Also, if Buckner fielded the ball cleanly, it was too late since the Mets had already tied the game one batter earlier. Buckner's error gave the Mets the win, but the game would have went into extra innings, and more than likely, just prolonged another inevitable loss for the Sox.