1. 'Good Will Hunting'
Before Good Will Hunting, Matt Damon was known as "Whatshisname from School Ties and Courage Under Fire." After Good Will Hunting, nobody would ever forget his name again. He wrote the screenplay about a troubled math genius with Ben Affleck and watched it become one of the most acclaimed movies of 1997. They won a Best Original Screenplay Oscar, turning them into A-listers almost overnight. Damon and Affleck have seen ups and downs since this movie, but it was the key moment that forever changed their lives. It's also a damn good movie.