Few movies have quite the backstory as Good Will Hunting. Written by Matt Damon and Ben Affleck because they weren't getting cast in any roles, it launched multiple careers, won Robin Williams his only Oscar, and wedged itself into our minds as one of the most iconic movies of the past 30 years. By no means the best or most popular, who doesn't know the story of the wicked smart janitor that solves the math problem on the whiteboard?