Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

The Joke

A doctor tells a patient named Mister Fong that they can take a flap from his thigh and graft it over his forehead, but that the "final course of action is up to you." The patient protests that this is just a physical -- a routine checkup -- and the doctor ominously replies, "And that's all it has to be, Mister Fong." The caption reads: "Dr. Morton convinced me to pay my medical bills on time."

The joke is that the doctor is essentially making a veiled threat: if the patient does not pay his medical bills, the doctor will perform unnecessary and disfiguring surgery on him during a routine visit. The phrasing "that's all it has to be" is a classic mob-style implied threat -- everything will be fine as long as you cooperate.

The Humor

The comic plays on anxieties about the power imbalance in the doctor-patient relationship. Patients are vulnerable -- they are literally in the doctor's hands -- and the comic takes this to a darkly comedic extreme by reimagining a physician as a loan shark who uses surgery as intimidation rather than healing. The silhouette of the patient in the final panel emphasizes his powerlessness and the menacing tone. The matter-of-fact caption at the bottom, treating this extortion as a reasonable motivator to pay bills on time, adds a layer of dry humor.