The episode where he sells his soul to the devil (Flanders. It’s always the one you least suspect.) for a donut. He doesn’t finish the donut, therefore the devil doesn’t get his soul. Home goes on about oursmarting the devil. Cut to burns in his office asking smithers who the “goat legged fellow” is and commenting that he likes the “cut of his jib”. Smithers replies that he is the prince of darkness, burns’ 2 o’clock.