I think it gets out of control...especially in New York, Boston, and Chicago....but it seems these fans all are extremely knowledgable...It's all about history, and where the teams "came from" really. Cubs, Sox, Red Sox, Yankees seem to have a great fan base just because they love the game of baseball, not because of attractions at the ballpark, etc.
Loooooong history = knowledgable fans = good fans = out of control fans usually (I can attest to that) :whistling: