Another strange interaction between Harvey and the portly store owner

Harvey: I've got the joy, joy, joy, joy down in my heart!
Miranda: Where?
Harvey: Down in my heart!
Miranda: Where?
Harvey: Down in my heart!
Harvey: I've got the peace that passes understanding, down in my heart!
Miranda: Where?
Harvey: Down in my heart!
Miranda: OK, get the fuck out NOW.
Harvey: Down in my -- oh. All right.