To legions of otherwise reasonable adults, it is a conflict that surpasses sports; it is locals against outsiders, elitists against populists, even good against evil… The rivalry may be a way of aligning oneself with larger philosophic ideals — of choosing teams in life — a tradition of partisanship that reveals the pleasures and even the necessity of hatred.
— Will Blythe, on the greatest rivalry ever.
(Source: Wikipedia)