Oh, and once, when I was in the Marines, I got a perfect score on my physical fitness test.

The line reads like a tossed-off aside—an “oh, by the way” credential offered to bolster a point or punch up a joke. By invoking his time in the U.S. Marine Corps and a “perfect score” on a physical fitness test, Carey contrasts an image of disciplined, high-performing toughness with his more familiar public persona as a comedian and TV host. The humor likely comes from the abruptness and self-aggrandizing specificity of the claim, which can function as a comic non sequitur or as a surprising detail meant to reframe how the audience perceives him. It also plays on cultural assumptions about Marines as exceptionally fit and resilient.