One Good Turn (1931)

Down and out Stan and Ollie beg for food from a friendly old lady who provides them with sandwiches. While eating, they overhear the lady's landlord tell her he's going to throw her out because she can't pay her mortgage. They don't realize that the old lady is really rehearsing for a play. Stan and Ollie decide to help the old lady by selling their car. During the auction a drunk puts a wallet in Stan's pocket. Ollie accuses Stan of robbing the old lady, but when the truth is revealed Stan takes revenge on Ollie.