In case there was any doubt, we think it's now safe to assume that the Pittsburgh Penguins and Philadelphia Flyers don't like each other very much.

The "Battle of Pennsylvania" took centre stage on Tuesday night, setting itself apart from the other seven games on the NHL slate by at times resembling a boxing match more than a hockey game. 

Things turned ugly late in the first period when Flyers centre Zac Rinaldo was ejected from the game for a dirty hit on Kris Letang.

The teams gathered for a brief scuffle after the check that saw Letang leave the game and not return, however it was apparently just a warm-up for what would follow. 

Perhaps forgetting that a goal was going to be needed to break a 1-1 tie, the Penguins and Flyers racked up a dizzying 82 penalty minutes in the first two periods alone.

Much of that parade to the penalty box, and in some cases to the showers, was due to four rounds of fighting in the middle frame.

Even scoring leader Jakub Voracek couldn't resist engaging in some good old-fashioned fisticuffs.

Round 1: Zach Sill vs. Michael Raffl

Round 2: Jakub Voracek vs. Rob Scuderi

Round 3: Luke Schenn vs. Steve Downie

Round 4: Pierre-Edouard Bellemare vs. Bobby Farnham

This tweet sums up how the Flyers felt about the hostile visitors to Wells Fargo Center:

Once hockey resumed, the Flyers managed to claim a 3-2 victory in overtime thanks to a goal by captain Claude Giroux, who handed the Penguins their third consecutive loss.