The Bears trailed throughout the game, but managed to tie it with a goal from Graham Mink just over two minutes remaining.
With the Bears trailing the Vikings, eventually allowed an anxious McMahon to return to the game.
Late in the fourth quarter, the Bears trailed by 4 when they recovered a fumble on the Vikings' 37.
In the first quarter the Bears trailed early after kicker Ryan Longwell hit a 36-yard field goal.
The Bears trailed early with kicker David Akers nailing a 45-yard field goal.
The Black Bears (30-3-2) trailed by 3-2 in the second period.
The Bears had trailed by 28-10.
But with the Bears trailing, 21-17, with 41 seconds remaining, he had lined up in a fourth-and-8 at the Bears' 36-yard line.
He also lost the ball on a third-quarter fumble at the Washington 17-yard line, when the Bears were trailing, 14-13.
The Bears trailed the Raiders, 10-7, 10 minutes were left before halftime and Jim Harbaugh was determined to make something big happen.