The first comes from Babel. This is the first and only scene in the entire movie in which we see these two characters have a real conversation.
Before the clip starts, Susan (Cate Blanchett) had asked Richard (Brad Pitt), "Why are we here?" Richard thought for a moment and responded, "To be alone." She looked at the people around them and huffed, "Alone," as if it was some kind of joke. There's a small argument about ice cubes, and then we see what follows in the clip:
Next, Children of Men, which tries to accomplish similar goals.
Do these scenes work?