'The Cold Hard Facts of Life' -- Porter Wagoner (1967)

Wandering Words: "Who taught who the cold hard facts of life?"

Returning early from a business trip, a man picks up champagne to surprise his wife. Another customer at the liquor store is buying wine for a party, he says with a wink. When the first guy realizes the "party" is being thrown by his philandering wife, he greets her with a knife instead of champagne.