The Jewish New Year is announced by blasts on a ram’s horn (shofar). Many people use much larger horns instead (a kudu, for example). This year, as part of the religious service, a woman picked up the ram’s horn to blow a few sounds, and not much came out—a few feeble toots. After squeaking out half the required notes, she switched to the kudu horn—she switched to additional capital. With the larger horn she blasted the entire congregation out of their seats—truly wonderful sounds.
Even in a religious service we can observe that the marginal product of labor is enhanced by additional capital—even in this context labor and capital are complements in production.
(HT to AB)