I told my doctor I had a problem with my hearing.

This joke gets its giggle from a clever bit of wordplay, specifically a pun that relies on how similar two words sound. The setup establishes that someone has a hearing problem, which immediately cues us up for a misunderstanding. When the doctor asks for "symptoms," a word crucial for medical diagnosis, the patient's impaired hearing twists it into something entirely different, setting the stage for a classic comedic misinterpretation.

The real punch comes from the patient mishearing "symptoms" as "Simpsons." Because of this auditory mix-up, instead of describing medical issues, they launch into a description of Homer Simpson, everyone's favorite yellow, doughnut-loving cartoon dad. The humor here is in the absurd contrast between the serious medical context and the unexpected pop culture reference, all thanks to a simple phonetic slip-up. Puns like this have been a staple of comedy for centuries, often playing on the quirks of language to create a laugh.