Colonel Beauregard and his faithful lieutenant the happy slave George

Right before the guys pull off the army rifles rip-off, they're seen at Freeman's apartment playfully reenacting a movie scene where a plantation owner and a dumb slave reunite after the war. Does anybody know whether that dialogue was from an actual movie or play about the postbellum Southern reconstruction? I googled a bit, but couldn't find anythinf with different keyword combinations. For some reason, the names (Beauregard, George) and the dialogue ("I can't pay you; carpetbaggers took over the plantation, which I had to mortgage; I wouldn't know whut to do with no money, massa!") ring a bell. Thanks in advance.