--Paraphrased from source of information: about.com

Que the huge sigh from the Buffalo side.

It couldn't have gotten any more heart wrenching for the Sabres than the 1999 Stanley Cup Finals. It was triple overtime in the sixth game of the final series against the Dallas Stars and the score was 1-1. Brett Hull, Stars, makes a ditch effort to score and the shot is saved by Dominik Hasek by rebound. Hull takes advantage of this right away and kicks the puck with his skate to his hockey stick. However, his skate slides into the goalie crease before the puck itself is in the crease. He shoots again and gets the goal to win the cup. Immediately, there was uproar and the Stars' celebrations were lost among the Buffalo fans complaining for a reassessment of the call to allow the goal.

The regulation back then regarding the goalie's crease was that an opposing team member way not stand inside the crease unless the puck is in there as well, first. If the regulation is broken, any subsequent goal obtained because of the broken regulation, would be invalid. This regulation was created to give some leeway and protection for the goalie. Hull was noticeably guilty of this when video reviewed by officials and pictures were looked at. However, how the NHL spokesperson rationalized not calling off the goal was that if the puck rebounded off of the goalie, post, or opposing player, the puck is still in the opposing player's possession, and thus the regulation is technically not relevant. This explanation was viewed by many as a way for the NHL to cover up its miscall, which I, personally believe to be true. However, the Stars still won and the Sabres have yet to win the cup. There is still no consensus on this particular case, which has been coined as "NO GOAl!", but the regulation has since been scrapped because of its flexibility and vagueness.
This world class game was much like the clash of titans.