The No. 1 moment to never mention to a Bruins fan is Boston's epic collapse against the Philadelphia Flyers in the second round of the 2010 Stanley Cup playoffs.
This year's defeat to Chicago was brutal, but this was only the third time in NHL history that a team came down from a 3-0 deficit to win. There's no doubt this is more humiliating to have etched in memory.
The B's took the first two games at home before dominating the Flyers 4-1 in Game 3 in the City of Brotherly Love. However, the victory came at a price. Center David Krejci dislocated his right wrist on a devastating open-ice hit by the Flyers' then-captain Mike Richards. Krejci needed surgery as a result and missed the remainder of the series.
Game 4 went to overtime, and veteran Simon Gagne scored the game-winner to keep the seventh-seeded Flyers alive.
No big deal, Boston fans thought. We'll oust them at home.
Easier said then done.
Philly controlled Game 5 from start to finish and it was a 4-0 combined shutout by Brian Boucher and Michael Leighton that extended the series once again. Now B's fans were starting to worry—New Englanders were only six years removed from the 2004 ALCS—so they knew a comeback was possible.
Philadelphia eked out a 2-1 win in Game 6 to force a winner-take-all Game 7 in Beantown.
Game 7 started perfectly for the home team—a 3-0 lead in the first period. All was well for the Bruins, who looked like the team from the first three games of the series.
But then James van Riemsdyk got the Flyers on the board late in the first. Scott Hartnell got Philly one goal closer early in the second before Danny Briere tied the game at three.
The fans wearing black and gold were as nervous as Amanda Bynes' parole officer.
And history repeated itself late in the third period for Boston. Just like 31 years earlier against Montreal, the Bruins were called for too many men on the ice, and their opposition pounced.
Gagne scored the game-winner with a snipe off the post to give Philly a 4-3 lead, which it wouldn't surrender.
As the clock expired, fans were left with the sight of orange and white jerseys mobbing each other on Boston's home ice. It was the worst loss in the history of the Bruins, and something you should never bring up to a B's fan.