16. 1968 Jets (won Super Bowl III)
Nobody gave the Jets much of a chance against the vaunted Baltimore Colts in 1968. Well, no one except for Joe Namath, who guaranteed a Jets win ahead of the game.
The league should have seen it coming though, as Namath was throwing to a pair of 1,000-yard receivers in George Sauer and Don Maynard. They also had a defense that shut down the favorite Colts and held them to just seven points.