Every team has their own set of superstitions. For the Chicago Cubs, the Curse of the Billy Goat has been blamed for keeping the franchise from winning a World Series for over a century.
Then there's the infamous Madden Curse that jumps from team to team. Players who appear on the cover of EA's "Madden NFL" series have either experienced an extreme decline in play or they've somehow gotten badly hurt, with only a few exceptions to the rule. Peyton Hillis, who appeared on the cover of Madden NFL 12 as a Cleveland Brown, attributed his decline to the curse.