Ikiru by Akira Kurosawa
I had heard this film rated well, however I really didn't expect what it threw at me. So now I've got a dilemma. I can tell you more about the film, and ruin the exploration part of viewing, or skip any movie internals knowing that you might skip the film. I think I'll risk it. ;)
The idea that we blend fact and fiction to make our lives "workable" drives this story; we all have our dreams/faiths/beliefs that let us put up with interim stupidity in order to get to some later good thing. Unfortunately, we sometimes delude ourselves too much for our own good and need to spend time examining the lies we tell ourselves. Ikiru wanders through one guy's life fluidly revealing both the power and pain inflicted by truth and lies.
FYI, you can get it free at archive.org.