The latest chapter in the growing rivalry between Seattle Seahawks head coach Pete Carroll, and his opposite number in the San Francisco 49ers top job, Jim Harbaugh, is set to play out in the NFC Championship game on Sunday evening.
With both teams aiming to reach the Super Bowl, the stakes could hardly be higher.
Add in a clash between two coaches with reported animosity and it could be a classic.
Ever since the pair first came up against each other in college football, there have been several controversial incidents which helped create an air of hostility between the two; from showboating play calls, to NFC West match ups.
The two coaches, who live and breathe competition, are sure to have more moments of controversy but here are the five key events which have brought us to where we are today...