Touchdown! When Justin Timberlake and Jimmy Fallon collaborate, dancing, music, and much, much goofiness usually ensue. And that's exactly what happened on Late Night With Jimmy Fallon on Tuesday, Sept. 10, when the two buddies treated the audience to "The Evolution of End Zone Dancing," their take on the many different ways football players celebrate crossing the end zone.

Just how many different happy dances did they come up with? Try 17! -- including "The Touchdown Robot," "The Butt Wax On Wax Off," and "The Old-Timey Railroad Car." Both clad in football t-shirts, the two pals hilariously boogie their way through a compilation of grid-iron dances for the performance, which was reminiscent of their viral "History of Rap" series.

The most memorable choreography? Perhaps "The Football Spin (Into the Love Scene From Ghost)," which has Timberlake and Fallon reenacting the famous potter's wheel scene between Demi Moore and Patrick Swayze.

Watch the video and tell Us: Which was your favorite dance?