Week 17's clash with the Minnesota Vikings is a massive game for the 11-4 Green Bay Packers. If they win, they'll be 12-4 and will have knocked the Vikings down to 13-3. With each team still having one game left remaining after this one (the Packers play the woeful Chicago Bears while the Vikings play the NFC-leading Detroit Lions) there's a very real chance both teams would finish at 13-4. And that would be great news for Green Bay.
In that hypothetical situation, the Packers — currently the sixth seed — would flip seeding with the Vikings.