Directed by Stuart Rosenberg
Written by Donn Pearce and Frank Pierson
IMDB

Luke (Paul Newman) gets arrested for cutting the tops off of parking meters while drunk. He's put on a chain gang. He wins the admiration of his fellow inmates through a series of events (which include him eating 50 hard boiled eggs and trying to escape a few times).
For some reason I always thought this was a western and not a prison movie. It's kind of a weird movie, too. Luke has a never quit attitude that gets him into some bad situations. It's never really explained why he was cutting the meters, either. Regardless, it's a really interesting character study film that is expertly directed. I don't think I will ever watch it again, but I'm glad I finally saw it.

9/10