Bears
AP

Bears cornerback Marcus Cooper turned in maybe the worst gaffe in the NFL this season

Sherrick McManis blocked a field goal and Marcus Cooper picked the ball up with nothing but green grass ahead of him on his way to the end zone. 

Then, for some reason, Cooper eased up a few yards from the end zone. What happened next was straight out of a Leon Lett highlight reel: Vance McDonald hit Cooper from behind, leading to Cooper fumbling the ball and it being batted out of the end zone for a penalty. The Steelers went to the locker room, then had to come back out for an untimed down from the one-yard line. After Charles Leno was whistled for a false start, the Bears kicked a field goal.

So Cooper cost the Bears four points. But...why? What was he doing?