The whole city rallied hard around the Sabres last year, and then they got smacked around in the playoffs. (The Sabres are a professional hockey team. Hockey is a sport that involves teams of players on ice skates who use curved sticks made of fiberglass to try to hit a small rubber disk into small goal. They used to show it on television.
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People in Buffalo really believed that the Stanley Cup was going to visit their city last year, and would right many many years of sports frustration. Instead, a team that used to be called the "Mighty Ducks" after a movie put out by their theme park/movie company former owners, won the cup. This was something of a downer in Buffalo, particularly since they've been playing hocky a heck of a lot longer in upper state New York than Anaheim.
So, the city is kind of down. Then the Bills rip off 4 in a row and they start to get excited. Imagine what this guy was thinking on his way to the stadium that night. "Hey, we could easily be 7-2. We almost beat the Cowboys. We SHOULD have beat the Cowboys, and they are great. We can beat the Patriots. We can play with these guys. We have the best home field advantage in football. This is prime time. This is our house."
Actually, this guy was probably thinking this all week, and the more he drank, the more he believed it. Somewhere around 35-10, he realized it wasn't happening. And he was mad.