The Philadelphia Eagles set off one of the biggest on-field controversies of the decade by throwing the game of football back to its roots. The Tush Push -- or Brotherly Shove, whatever -- was a rugby scrum-esque addition that took advantage of the team's strength in the trenches and a backfield capable of squatting a combined 2,000 pounds. It guided the Eagles to a 72 percent conversion rate on fourth down and, vitally, a Super Bowl win last February.
Like any meteoric rise, the play had its detractors. Pushing an offensive ballcarrier forward from behind had previously been illegal in the league, but that rule was changed nearly two decades ago.