The 2002-03 Mighty Ducks of Anaheim were a real Cinderella story making it to the Stanley Cup Finals against the New Jersey Devils. The 2003 Mighty Ducks of Anaheim's inspiration came from their eventual Conn Smythe winning goaltender, J.S. Giguere and their captain and regular season leading scorer, Paul Kariya.
Although that entire playoffs was filled with inspirational moments for the Ducks from their first round sweep of the Detroit Red Wings to their unexpected birth in the Stanley Cup Finals. I believe that most inspirational moment came in Game Six of the Stanley Cup Finals with the Ducks down 3-2 in the series.
With the Ducks winning the game 3-0, Scott Stevens (without a doubt one of the hardest hitters ever to play the game) did what he did best: give a concussion. He literally knocked Paul Kariya out on the ice and he was motionless for a few minutes before finally coming too. Although Kariya was able to get off the ice under his own weight people thought that his season was done and the Ducks would have to find a way to continue without him.
After that moment the momentum of the game shifted and the Devils had all the momentum. It was a miracle that they only scored one goal by the end of the period.
What happened next would is in my opinion one of the greatest Stanley Cup moments: Kariya came back for the start of the third period. With the return of Kariya, all the momentum shifted back to Anaheim. The Devils were on the ropes and everybody knew that there was going to be a Game Seven.
What happened next would be unbelievable. Kariya coming down the boards and winding up for a slap shot, blowing it by Martin Brodeur. Although the Ducks would eventually lose Game Seven and the Stanley Cup, that single game effort by Paul Kariya is probably one of the greatest single player efforts in playoff history.
If you get a chance, look at the following video: