There is a saying that human nature can't be made over so easily.In fact the human nature is too complicated and elusive that people are always curious to know what is humanity. Perhaps the answer can be find in the movies.In the Requiem for a Dream ,the hopes and dreams of four ambitious people are shattered when their drug addictions begin spiraling out of control. A look into addiction and how it overcomes the mind and body. In Se7en, "seven deadly sins" include pride, envy, rage, sloth, greed, gluttony and lust which are human nature. There is no doubt that everyone have been committed. This is only the original sin of human beings, and this movie brings people into the darkest place of human nature. Although it is fictional, its breath has already entered the thoughts and feelings of reality.
There are many calssic movies about humanity, such as The Descent,The Mist, Dogville, The Dark Knight, Compliance, The Divide and so on. Here are 20 movies, just pick one and enjoy it.