Well, if you're able to wear any Packers garb to the game, that should set the entire stadium against you. On the other hand, however, you may not make it out alive. I suggest a Marcus Allen Chiefs jersey though. It always sets off Raider fans here when I bust it out.
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I think the Pats last year showed you can win without a great passing game. As long as your QB does not make mistakes and you have a great coach. The 49ers do have the players in place to have a good passing game.