Crackers (1984)

IMDB
Genre : Comedy, Crime, Thriller
TRAILER
Director : Louis Malle
Stars : Donald Sutherland, Jack Warden, Sean Penn, Wallace Shawn
Plot : Reduced to minding the counter at a crusty pawn shop, Weslake stumbles onto a scheme by some disgruntled misfit clients to rob the place. Rather than blow the whistle, however, he insinuates himself as the heist's mastermind.