Maybe it's just my imagination, but it seems as though in close super bowls, there is a ton of scoring late in the game -- at least it's been that way in the last decade since they increased the commercial time and the halftime length. I think the defenses are exhausted in these marathon games. They start late, last long, and have lots of standing around time. I think after 3 hours, the adrenaline has long since burned off and many of these teams are playing on fumes. I'm think, for example, of the NE/Rams game, where 17 points were scored very late. The Carolina game, where defense was nonexistent at the end. Last year's game, where the teams scored 14 of the total 31 points in 2 minutes. And this game where there were 21 points in 8 minutes. Maybe there are others. It also seems as though you want the ball in your hands with a chance to win. So long as there's some manageable amount of time on the clock and you're not in a hail mary situation, teams seem to be able to drive to win.