Twins fans generally travel to Miller Park in large numbers as well. The demographics are usually the same as many Brewers/Cubs fans -- collage frat boys. However the problems with two rival/fanatical fanbases in tight quarters never seemed to be a problem. I used to work in the Fan Zone at MP and never found any problems with the hoards of Twins fans. They were young, (older than me at the time) and drunk, but never seemed to cause any problems. Many (certainly not all) Cubs fans went out of there way to be jerks to fans in the stands and anyone working in the stadium for that matter. Over the years I saw and heard about all sorts of crazy stuff. For example, a few years ago when Brewers/Cubs series were dominated by Cubs fans, there was a fight in TGI Friday's that sent someone actually through the drywall. Didn't see this in person, but it sounded pretty serious. In person, I saw a fan getting hauled off by the police in the service level of MP... and followed the trail of blood that was coming from his head. He was of course, shirtless, and screaming that he didn't do anything as he kicked his legs into the air as two officers held him by the arms. T'was an interesting night.