Just for teams I root for:
Rangers: Losing 2015 ECF vs the Tampa Bay Lightning 2-0 at MSG after witout losing a Game 7 at MSG previously and being the defending Eastern Conference Champion
Bills: 96 Wild Card game vs the Jaguars, Jim Kelly last game and end of the run for the 90s Bills imo, sure they made the playoffs in 98 and 99, but 96 was their last chance to win a Super Bowl.
Nets: I would say losing Game 6 in ECSF to the Pistons, I think if Nets win that series, they go the Finals for the 3rd straight year and with the Lakers with their issues, Nets might have had a chance.
Yankees: 2004 ALCS, enough said