Broncos at the two, down by a touchdown. Cutler fumbles, but the ref wrongly blows the ball dead. Broncos score, but instead of going for the tie, Shanahan goes for two and the Broncos get it for the win. The announcers seem to think Shanahan was trying to give the Chargers a chance to make up for the bad call. I don't think so.
It's happened before.
Update: Story. Shanahan went for it, of course, because he didn't trust his defense.