Vikings at Bears: There are some in the NFL who wonder how Brett Favre, at this late stage of the season, would hold up under very cold conditions. Given the way the NFC playoff situation is shaping up, he might be dome-bound from here on out. But this is another game where a struggling team possibly sticks it to its thriving rival. Throw in all of Favre’s latest drama — I leave a game when I want to leave a game — and you have to wonder about the Vikings. I don’t necessarily think the upset happens here, but the Bears gave the Packers a good fight a few weeks back, and will try to do the same here. Jay Cutler has actually been quasi-okay at home. Chicago’s rushing attack and defense have been so bad, however, that they have generally trumped all else come game day. Lovie Smith had best avoid another blowout.