The optometrist fell into his lens grinder

This joke is a perfectly ground example of wordplay, specifically a pun, that hinges on the double meaning of a single word: "spectacle." On one hand, spectacles are another term for eyeglasses, the very items an optometrist deals with daily. On the other, "to make a spectacle of oneself" is a common idiom meaning to behave in a foolish or embarrassing way that draws attention. The humor arrives as the unfortunate eye doctor manages to fulfill both definitions at once, literally becoming part of the eyewear world while undoubtedly causing quite a scene.

The setup cleverly paints a picture of an expert in his element, only to have him meet an absurd, if thankfully fictional, end within his own tools. While lens grinders are real machines used to precisely shape prescription lenses, the idea of a person being processed by one is pure, dark comedy. The idiom itself has been around for centuries, describing public displays of awkwardness, and this joke gives it a morbidly literal twist. It’s a classic example of how a simple turn of phrase can transform a grim scenario into a quick laugh, proving that even a trip to the eye doctor can inspire some unexpected humor.