The Atlanta Falcons
Atlanta’s astonishing collapse in 2017 remains one of the most notorious games ever. Some people may think that it’s difficult to point to one error but that’s not true. They played well for three quarters and led 21-3 at halftime. But Kyle Shanahan’s playcalling was ludicrous and gave the Patriots the momentum.

He failed to change to a running game and insisted on passing the ball. Eventually, the Falcons ran out of gas and this allowed the Patriots to make a ridiculous comeback. In the end, it was a terrible mistake that haunted the franchise for years. It also signaled the beginning of the end for Dan Quinn in Georgia (via Sporting News).