There is nothing more annoying than hearing a fan say: "the only team that can beat [my team] is [my team]," implying that said team is so dominant that the only way they could possibly lose is by shooting themselves in the foot. If the opposing team is able to upset the favorite, this arrogant mantra downplays the opposing team's accomplishments by implying they were lucky enough to be the beneficiary of the far superior team's mistakes.
Surely, there were tons of Packers and Saints fans that felt this way this past weekend, and there will be Giants and 49ers fans that feel this way now. Fans of both teams are uttering the old phrase "if we play our A-game, it doesn't matter who we're playing." But what if both teams play their A-games?