Theory #1 - The beleaguered couple has been forced to store their tomato slices on the counter, next to the sink, because their tomato rack is in disrepair. Instead of simply replacing the often-broken tomato rack, the spendthrift husband will attempt to repair it, despite his total lack of any qualifying skill. This is funny.
Theory #2 - After inviting their friends over for Saturday brunch, the wife now regrets complaining about washing all the dishes, now that her husband has apparently decided to murder their guests and dismember the bodies. This is funny.
Theory #3 - The husband is about to grudgingly begun to make good on his promise to "build lunch". This is funny.
Theory #4 - The husband is about to tackle a handful of household chores, which is odd. Usually a breakfast of "splats" leaves him tired and sleepy.
Theory #5 comes to us from comedy supersleith MisterFancyHotBalls_2. Thanks MFHB2! - The Husband has realized the Wife has become unchained from stove again, & no longer pregnant. So he will be building her a small "kitchen cage", after nailing the twin beds together for the evening. This is funny (in a sexist way).
Theory #1 - The woman has produced four puffs of breath, while the dog has produced three. This indicates that the woman was laboring harder than the dog during their walk. She will probably suffer from heart disease in her autumn years. This is funny.
Theory #2 - The homeowners have apparently purchased an area rug designed and signed by the profoundly unfunny comic artist Ted Key, who is not known for his understanding of humor or rug-making skill. This is funny.
Theory #3 - The wall is named "Hazel". This is funny.
Theory #4 - The dogwalker has returned, not to her own house, but to the home of Lucille Ball, who is either too polite or to frightened to alert the angry intruder to her mistake. This is funny.
Theory #5 - Both the dog and the woman are steam-powered. This is funny.
Theory #6 has been postulated by MisterfancyHotBalls_2 for your sanitation. Thanks again for helping us understand the comedy of the unfunny past, MFHB2! - Housewife "Maria" is unhappy that her maid has just walked in with her son, who looks strangely similar to her husband "Arnold". This is funny(?)
[Commenter theories will be published in this peer-reviewed journal. -Mgmt.]