What do you call a lazy doctor?

The humor in the punchline, "Dr. Do-little," is a classic example of wordplay, specifically a pun that relies on homophony. The joke cleverly twists the familiar sound of "Doctor Dolittle," the beloved character from children's literature, to imply a physician who, true to the "lazy" setup, would "do little" work. It's a simple linguistic trick that hinges on the audience making an immediate connection between the sound of the name and the concept of minimal effort, which is certainly not what you'd want from your medical professional.

The original Dr. Dolittle, created by Hugh Lofting, was a kind and adventurous physician who famously learned to speak with animals, embarking on many extraordinary journeys. While Lofting's character was anything but lazy, his distinctive name provides the perfect phonetic foundation (Review) for this joke. The inherent irony of a doctor, a profession typically associated with demanding hours and life-saving work, being described as "lazy" adds another layer of gentle absurdity to the pun.

This joke works because it combines a widely recognized cultural reference with a straightforward concept of idleness. The immediate recognition of the name and the clever, yet simple, twist applied to it are what make it a quick and satisfying laugh, playing on our expectations of a doctor's diligence versus the humorous suggestion of doing very little.