Gangs of New York
I remember watching this movie for the first time the year I was 20. It is so great. Such a fantastic story.
There are many ways I think it is a great movie. Part is how it starts out as a fight that the main characters father started, and died during.
And then it is started up again by the son when he is grown up. It is a interesting look at how conflicts will never go away unless properly dealth with.
And I also love how there is the his Civil War thing going on that nobody cares about.