The final confrontation between Clough and Revie
Clough, having just been sacked by Leeds, stubbornly remains in denial of his true feelings and ambitions. He finally divulges the origin of his resentment for Revie, only to have Revie insist he has no recollection of snubbing him years earlier.
Michael Sheen plays Clough perfectly, as you witness years of piling bitterness come crashing down, leaving him questioning if his tenacious journey had been worth it.
I'm an American and not even a huge football fan, but Clough's realization was heartbreaking and, in my opinion, evoked Citizen Kane emotions.