I'm kind of afraid to watch Before Midnight at this point because I love Before Sunrise and Before Sunset so much and I don't want a third movie to diminish that feeling. I'll bet Jesse and Celine would relate to that.
An absolutely brutal film. The casualness with which the most horrible of atrocities are treated by their perpetrators is truly shocking, especially for the fact that those perpetrators are shown as they are: three-dimensional, conflicted human beings. It's a fascinating and appalling study in how the human mind can rationalize doing terrible things, up to a point at least.