S07E04 Bart Sells His Soul
When Rev. Lovejoy disciplines Bart for a prank he pulled in church - he tricked the organist into playing Iron Butterfly's ""In-A-Gadda-Da-Vida" - he and co-conspirator Milhouse begin arguing over whether man really has a soul. Bart scoffs at the notion and agrees to "sell" his soul (a piece of paper with the words "Bart Simpson's Soul") to Milhouse for $5. A series of situations makes Bart realize maybe he really did sell his soul, prompting him to go all-out to get it back from Milhouse, who isn't willing to sell. Meanwhile, Moe attempts to open a family-style restaurant inside his tavern, with the gimmick that if he doesn't smile when servicing a customer, the meal is free. Moe's surly demeanor and the stress of running such a business alone conspire to do the establishment in.