The mattress salesman was always tired

This joke gets its bounce from a clever play on words, using the double meaning of "spring." In the context of a mattress salesman, the word immediately brings to mind the literal coiled metal components that give a mattress its support and comfort. These springs are essential to a good night's sleep, and without them, a mattress would quickly lose its form.

The humor, however, truly comes alive with the idiomatic meaning of "spring." To "have a spring in one's step" means to be full of energy, enthusiasm, and vitality. So, while the salesman might be tired from a long day of demonstrating beds and dealing with customers, he never loses his metaphorical inner "spring" or positive outlook. It's a pun that stretches between the literal construction of his product and his own resilient spirit in the often-exhausting world of sales. Historically, coil springs were first patented in 1865 and soon found their way into mattress construction, evolving over time to improve comfort and support.