The NHL's most bitter rivalry entered a new chapter in the 2011 postseason. Here are a baker's dozen of its most memorable moments. Late in the second period, Boston's 6'-9", 255-pound defenseman Zdeno Chara drove the head of Canadiens forward Max Pacioretty into a turnbuckle between the team benches in Montreal's Bell Centre. Pacioretty suffered a severe concussion and fractured vertebra, but Chara received only a game misconduct penalty. Canadiens fans, and the team's owner, were outraged that the NHL did not hand down a stiff suspension, and local police opened a criminal investigation into the hit. Click here to watch the video.