Explain SMBC — the wiki for Saturday Morning Breakfast Cereal

The Joke

The comic opens with a statement that "recent scientific studies suggest that fish do not feel pain in the same sense that humans do." A philosopher then steps in to argue that if this is the case, the findings could also undermine 30 years of his own work. He warns that this could logically extend to re-evaluating whether intelligent dolphins and bonobos feel pain, and eventually to questioning a "species of salmon." The final panel delivers the punchline: someone asks, "So if someone told a fish a really cruel joke, it wouldn't feel bad?" and the philosopher, alarmed, says "Soon" -- implying that this absurd line of reasoning is exactly where things are headed.

The Humor

The comic satirizes the way scientific findings about animal cognition get stretched far beyond their original scope. A narrow result about fish nociception (pain processing) gets extrapolated by a philosopher into an ever-expanding cascade of doubt about animal sentience in general. The joke highlights the sometimes uncomfortable intersection of animal cognition research and philosophy of mind: a single study about fish pain receptors can, in the hands of an eager interpreter, be used to question the inner lives of increasingly complex creatures. The punchline -- worrying about whether fish can be emotionally hurt by a cruel joke -- takes the slippery slope to its most absurd endpoint.

References

The comic references real ongoing scientific debates about fish pain. Studies by researchers like Lynne Sneddon have argued fish do experience pain, while others like James Rose have contested this, arguing fish lack the neocortical structures necessary for conscious pain experience.