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If you happen to take a look at the history of Super Bowl odds (located here, per OddsShark), you might notice something strange.
Oftentimes, a game in which the spread is three or fewer points is decided by a much wider margin than anticipated.
On seven different occasions, a game with such a spread has ended with a deficit of 10 or more points, with the most infamous case being Super Bowl XLVIII. (Denver, a two-point favorite, lost 43-8 to Seattle.)
But other times, a Super Bowl with a double-digit spread turns out to go against the established narrative leading up to the contest.