Doctor, every time I drink coffee, I get a pain in my eye.

This classic zinger is a masterclass in misdirection (Review). The setup presents a seemingly bizarre medical mystery, making our brains search for some strange biological connection between a hot beverage and eye pain. The punchline then pulls the rug out from under us by revealing the problem isn't medical at all, but painfully and laughably physical. The humor comes from that sudden, crashing shift from a complex diagnosis to an incredibly simple, self-inflicted mistake.

As a staple of the "doctor joke" category, this gag plays perfectly on the dynamic between a clueless patient and a deadpan physician. Instead of offering a complicated prescription, the doctor provides a dose of pure common sense. It takes a universal daily ritual—stirring a cup of coffee—and pushes it to an absurd conclusion. The joke is a hilarious reminder that sometimes the most baffling problems have the most obvious solutions, especially when we're the ones causing them.