In the final game before [the AFL-NFL merger](http://www.nfl.com/videos/nfl-network-top-ten/09000d5d81113e47/Top-Ten-Things-that-Changed-the-Game-AFL-NFL-Merger), the [Chiefs](/teams/kansascitychiefs/profile?team=KC) pulled off the upstart league's second straight upset win over the established NFL.
Not many believed that the [Vikings](/teams/minnesotavikings/profile?team=MIN) could beat a [49ers](/teams/sanfrancisco49ers/profile?team=SF) team that finished 13-2, and featured Joe Montana at his peak and a rising WR in Jerry Rice.
Behind backup QB Jeff Hostetler, the [Giants](/teams/newyorkgiants/profile?team=NYG) put together a game plan for success against the high-flying [Bills](/teams/buffalobills/profile?team=BUF) in this edge-of-your-seat thriller.
When replacement players were used during a strike in the 1987 season, the [Redskins](/teams/washingtonredskins/profile?team=WAS)' final replacement game helped inspire a movie.
One year removed from their inaugural season, the expansion [Jaguars](/teams/jacksonvillejaguars/profile?team=JAC) went into Mile High Stadium and shocked the football world.
A year after the [shocking upset against the Jaguars](http://www.nfl.com/videos/nfl-network-top-ten/09000d5d8111b706/Top-Ten-Biggest-Upsets-1996-Jaguars), the [Broncos](/teams/denverbroncos/profile?team=DEN) pulled off one of their own against the defending [Super Bowl](http://www.nfl.com/superbowl/48) champion [Packers](/teams/greenbaypackers/profile?team=GB).
Fresh from a move from the fledgling All-American Football Conference, the rogue [Browns](/teams/clevelandbrowns/profile?team=CLE) dominated the two-time defending NFL champion [Eagles](/teams/philadelphiaeagles/profile?team=PHI).
Before he married a supermodel and was a national icon, [Tom Brady](/player/tombrady/2504211/profile) was a relative unknown leading the [Patriots](/teams/newenglandpatriots/profile?team=NE) to [an improbable Super Bowl win](http://www.nfl.com/videos/nfl-super-bowl/09000d5d80151d5f/Super-Bowl-Memories-Super-Bowl-XXXVI).
The [Patriots](/teams/newenglandpatriots/profile?team=NE) steamrolled to an 18-0 record en route to [Super Bowl XLII](http://www.nfl.com/gamecenter/recap?game_id=29526&displayPage=tab_recap&season=2007&week=POST21), where the [Giants](/teams/newyorkgiants/profile?team=NYG) prevented New England's pro football immortality.
Joe Namath made a famous guarantee before [Super Bowl](http://www.nfl.com/superbowl/48) III, but not many believed the AFL's [Jets](/teams/newyorkjets/profile?team=NYJ) could even match up with the NFL's [Colts](/teams/indianapoliscolts/profile?team=IND).
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