Matt Damon: 'Mystic Pizza' (1988)
Before he was Jason Bourne or Will Hunting, Matt Damon was Steamer, the younger brother whose palate wasn't as refined as his rich family's.
Watch the scene in which Daisy (Julia Roberts) attends a dinner with Charlie's (Adam Storke) family where nothing seems to go right. Damon's "aw shucks" face proves he has only gotten better with age.