One of Afflecks first big roles was as one of Will Huntings childhood buddies in Good Will Hunting - no doubt thanks to his own brother and their real-life childhood friend writing and starring in the film. Rewatching it always provides enjoyment, if only to see Caseys hilarious turn as Morgan, the old friend that no one wants to hang out with anymore but you just dont have the heart to cut off entirely. By turns infuriating and disgusting - lets not forget that he masturbated into Chuckies (Ben Affleck) favourite baseball mitt - Casey actually proved that he had comedic chops first here, with the dramatic personae coming later.