The New England Patriots were headed toward one of the most embarrassing championship defeats in NFL history when they fell behind 28-3 to the Atlanta Falcons in the third quarter of Super Bowl LI in February of 2017.
Even in the fourth quarter when the Patriots were making the score a little more respectable, the Falcons still had a 99.6 percent chance to win (per ESPN analytics) with 9:00 remaining and Atlanta leading 28-12.
The Patriots weren't going to lay down, and with the leadership of Tom Brady, they engineered the greatest comeback in Super Bowl history.