I think the last one would have to be The Godfather because it was such a powerful story. There was lots of violence in it but I could take it because I thought there was a reality to it. It wasn't gratuitous, it was just these guys' story.
Maybe there's a chance to get back to grown-up films. Anything that uses humor and dramatic values to deal with human emotions and gets down to what people are to people.
And perhaps, posterity will thank me for having shown it that the ancients did not know everything.