Since the lockout the Maple Leafs have the worst winning percentage (0.359) in all of hockey during games they're involved in a fight.
Other notable details:
Detroit has only been in a fight in 14.4% of their games, compare that to Anaheim who have the most with 54.6% of their games containing scraps.
The Capitals win percentage plummets if they're involved in at least one fight from 0.498 to 0.393. I'm not sure what conclusions to make of this.
The LA Kings improve their win percentage by the most, a 0.085 increase, if they dropped their gloves in a game.
Note: This doesn't include this year as I don't have the data yet, though a manual count could be pretty easily done for the Leafs. Also my data seems to be missing two games somewhere.
I'll be extending my research to determine the game score situations with which these fights take place.