Which 10 Movies Do You Wish Everyone Could See and Why?

A while back, I read an article for bloggers suggesting that one of the best ways to draw traffic into a site is to post "top 10 lists" for others to view and debate with you.  So here's one with a little bit of a twist... Every so often, you see a movie that touches you deeply and makes you really think about something, or moves you to change your mind about something.  If you could pick 10 movies that were required viewing for everyone you know, what movies would those be and why would you select those particular films?