The Colts have been playing most of the season without head coach Chuck Pagano, who has been out while battling leukemia.
This team, which was 2-14 a year ago, managed to turn things around in historic fashion, compiling a record of 10-5 to this point under Arians' leadership for most of the season.
And while many fans have been critical of Arians' playcalling, nobody can deny that he's done a phenomenal job of keeping his team focused and ready to play every single week.
This playoff-clinching victory was ugly, as many of the team's 10 victories in 2012 have been. The Colts allowed an astonishing 352 yards rushing, as Jamaal Charles went for 226 yards and a touchdown and Peyton Hillis rushed for 101 yards.
But rookie quarterback Andrew Luck led his seventh game-winning drive of the season in the fourth quarter, hitting Reggie Wayne on a seven-yard touchdown pass to seal the victory for the Colts and secure an improbable playoff berth for his team.
If that's not cause for celebration, then I don't know what is. Sure, Arians' rendition of the popular "Gangnam Style" dance won't win him any awards, but nobody will fault him for trying.
Dance on, Arians. Dance on.
Note: Pagano is expected to be on the sidelines to coach the final regular season game for the Colts (h/t AP).