The Godson (1998)

This satire on mafia pictures tells the story of the Calzones, a mob family having some troubles (including a serious lack of smarts). Guiseppe Calzone, aka "The Guppy," has taken over the family business after his older brother dies, but his aging father realizes he's not the right man for the position. Dad ships Guiseppe off to Mafia University, but leaders of other crime families see this as an opportunity to move in, and soon an all-out war breaks out.