(VIDEO): Downie sucker punches Hillen, sets off a melee!

The Washington Capitals and Pittsburgh Penguins certainly aren't the best of friends. In fact I am pretty sure these two teams loathe each other. Tuesday night's tilt in Pittsburgh was a very chippy affair. Alexander Ovechkin's slash on Kris Letang got the rough stuff going and the violence only escalated from that point on. On this sequence the Penguins fourth line was looking to get a good scoring opportunity by crashing the net. Steve Downie and Jack Hillen engage each other in right in front of goaltender Marc-Andre Fleury. The two exchange blows, but it was Downie's right cross that sends Hillen to the ice. Then all hell breaks loose.  The two teams go after each other and Craig Adams's cross check on Tom Wilson is the icing on the cake. Something tells me this is not the last we've seen of these two rivals.