Maude S02E01 "Walter's Problem: Part 1"

A night of partying ends with many questions for Maude. How did Maude and Arthur end up in bed together? Why is her living room decimated? Who made a crank call to Maude's mother? The answer to the last question is Walter, and Carol's comment that Walter may have a drinking problem upsets him. Walter, who insists that he can drink with Maude anytime he wants, gets so drunk that he ruins Phillip's birthday cake, and after an argument, Walter slaps Maude across the face.