Are you excited about the opening of the baseball season? Ah, the leather, the pine tar, the rosin–and that's just the hot dogs.

O’Brien’s joke riffs on the sensory nostalgia that surrounds baseball’s opening day—especially the iconic smells of the sport: leather gloves, pine tar on bats, and rosin on the mound. The punchline pivots by attributing those same “authentic” aromas to ballpark hot dogs, implying they’re so processed (or so steeped in stadium atmosphere) that they seem to contain the equipment itself. The humor depends on incongruity and affectionate satire: it both celebrates baseball’s ritualistic romance and punctures it with a comic reminder of the gritty, commercial, and sometimes dubious realities of the fan experience.