No Country For Old Men
Despite the brutality of this film, it ends on a somewhat calm note. Sheriff Bell is caught on a long monologue discussing his dreams and aspirations. The undertone of the speech are darker and about his failures, which is really what the movie is about.
Memento
Memento actually works backward. The end of the film (the beginning of Leonard's journey) shows us that Leonard is Jankis and his brain simply created a mystery so that he could cope with his own guilt. He solved his own mystery.