Baby caca is like Kryptonite to a father. Even the dog says, "You don't rub his face in it."

In this joke, Williams riffs on the gap between cultural expectations of fatherhood and the visceral realities of infant care. By comparing baby feces to “Kryptonite,” he casts the father as a would‑be superhero abruptly weakened by an unglamorous domestic task—diaper duty. The punchline, in which even the dog supposedly offers moral guidance (“You don’t rub his face in it”), heightens the absurdity through anthropomorphism and reversal: the animal becomes the voice of practical restraint. The humor depends on exaggeration and taboo bodily imagery, but it also normalizes parental discomfort and turns it into a shared, comic experience.