Recognition....
I recently watched this film again after not having seen it since it was in theaters. I'm sure others have mentioned it, but the scene in which John first recognizes Nokes in the pub really gave me the chills. The look of recognition and awareness on his face the second he realizes he's looking at Nokes, and then the wave of emotions John experiences after he goes into the bathroom: fear, anxiety, shame, and finally, joy, is very powerful to watch. The music playing on the jukebox fits perfectly.
It's a really powerful scene.