The greatest thing about the GF Trio is the accumulation of magnificent scenes, but since we all know that, my pick for my current mood would be:

GF1-Restaurant Killings
GF3-Final Scene(s) on steps

and for GF2, I agree with the following-- when Kay is telling Michael that she had an abortion.

"The look on his face - especially his eyes (that "Corleone Stare" that's described in the novel) - was just incredible"


and also when Michael realizes Fredo betrayed him