Ah, it's good to see that other people have remembered quotes. And, of course, the point about how we'll remember quotes later on is well-taken, but I'm just used to dialogue making a bigger impression than this. Eh, maybe I was just tired.
I know people are somewhat confused by his switching of sides, but I think when we come out on the other side of this, Mac is going to emerge as one of the 3 or 4 best things about this film. Winstone was solid, and he delivered everything he was given extraordinarily well. Koepp really brought it for him, and somehow, Indy's relationship with him was made more poignant and real than the one he had with either Marion or Mutt.
See, I remembered the "they weren't you" line, I just didn't care for it, not so much because I never got on the Indy & Marion bandwagon but because Marion's inclusion this time around just didn't seem justified by the writing or by Allen's smiley performance.