I got one from each sport.
1) Kerby Joseph intercepts Rodgers to effectively end the Packers season. This was the moment I knew this Lions team was different and that they have arrived.
2) Yzerman's OT goal in game 7 against St Louis. Series clinchers are always good. BTW, I miss Gary Thorne calling hockey games.
3) Ordonez ALCS walkoff. This was a magical season that came out of nowhere. Heading into the playoffs, it looked like the magic had worn off only to be turned on again.
4) Prince block shot in the Eastern Conference Finals. A complete turning point in the serious. The Pistons could have lost that game and went down 0-2 in the series.