I don't know about the best movie ever but it would more than likely make my top 20.
Anyone who likes the movie should pic up the novella by Steven King called Different Seasons. It has both Stand By Me (The Body) and The Shawshank Redemption (Rita Hayworth and Shawshank Redemption) in it. A lot of people don't even know that Steven King wrote those two stories. Great stories and movies.