Penguins-Flyers rivalry still going strong as OT ends in mayhem 

The Pittsburgh Penguins and Philadelphia Flyers share a state, and also one of the NHL's fiercest rivalries. It is still going strong even though neither team has had much success over the past couple of years. They showed it on Tuesday night in the Flyers' 3-2 shootout win. 

While the game was ultimately decided in the shootout, it was the overtime period — and specifically the ending of it — that is going to get most of the attention.

Simply put, the overtime ended in mayhem and took each team's best shootout player out of the tiebreaking skills competition.

End of overtime brawl takes Sidney Crosby, Trevor Zegras out of shootout

The overtime period itself was chaotic as both teams had potential game-winning goals disallowed.

Pittsburgh's Evgeni Malkin thought he scored the game-winner halfway through the period, only to have it disallowed because he had come on the ice too soon for goalie Arturs Silovs during a delayed penalty situation, resulting in a premature substitution. 

Just a couple of minutes later, Philadelphia's Tyson Foerster thought he scored the game-winning goal only to have it called back because the Flyers were offside entering the offensive zone. 

Neither team came close to scoring again. But as the overtime period came to a close, the two teams ended up engaged in a mini line brawl that was initiated by an exchange between Foerster and Pittsburgh's Parker Wortherspoon. Things really popped off when Flyers forward Trevor Zegras pushed Noel Acciari's head while he was engaged on the ice in another scrum.

Acciari immediately went over Zegras, only to be held back by the linesmen.