In 92 years of rivalry, it had never happened. Until that gray December day in the city of broad shoulders.
On the last day of the 2013 campaign, Soldier Field in Chicago hosted the first-ever winner-take all regular season finale in the long history of the Packers-Bears rivalry.
Chicago was a half-game ahead of 7-7-1 Green Bay entering the game. The winner would clinch the NFC North title after a long and arduous journey.
Green Bay's route to that game was incredibly painful. Particularly in the left shoulder of Aaron Rodgers, which was separated by Bears linebacker Shea McClellin in November.
That loss turned the Packers from a definite Super Bowl contender into a squad struggling to stay alive in any playoff race. The quarterback carousel started with Seneca Wallace, followed by Scott Tolzien and finally Matt Flynn who went 2-2-1 with a pair of comeback wins that kept the Packers in the race.
Then, just a few days before the championship-decider in Chicago...
Two days after that happy announcement, the Packers also got Randall Cobb back from injury - a full arsenal returning to the Packers' offense for this ultimate showdown in the NFL's ultimate rivalry.
And wouldn't you know it...
In a game with five lead changes, Green Bay was down 28-27 in the final minutes.
Aaron Rodgers - who was in his first game back from a broken shoulder - engineered a five and a half minute drive including three fourth-down conversions.
The first, with 4:41 left: A John Kuhn fourth-and-one plunge for one yard deep in Packers territory.
The second, with 2:00 left at the Green Bay 44: A fourth-and-one completion to Jordy Nelson near midfield.
The last of them came on 4th-and-8 just ahead of that midfield stripe.
Rodgers dropped back and was about to get pummeled by a man who was to become his teammate one year later, linebacker Julius Peppers. John Kuhn plastered Peppers into next Tuesday to keep Rodgers on his feet.
Meanwhile, Cobb got past Bears secondary man Chris Conte. Way past him. Like a zip code past him.
Rodgers saw him free, and with 46 seconds left, the rest is history.
The two guys who three days beforehand were questionable to even play gave Green Bay a 33-28 triumph and their third of four straight NFC North titles.