Green Bay Packers – 2011
The Packers went 15-1 in 2011 and had history on their side. No team had failed to reach the conference championship game before this game. Meanwhile, the defending Super Bowl champions had experience and one of the top quarterbacks in the sport (via Bleacher Report).

However, the Giants defeated them somehow and turned them into a one-and-done team. The Packers’ incredible regular season record papered over the cracks in their defense. But Eli Manning exposed them as one 37-yard touchdown pass showed. It was a bad day at the office for the Packers because they shouldn’t have lost.