I'd love to change the world, but I can't find a big enough diaper.

Kaplan’s line is a compact piece of absurdist wordplay that pivots on the double meaning of “change.” Instead of “change the world” in the lofty sense of reforming society, the punchline reframes “change” as changing a baby’s diaper—then scales the literal image up to the size of the planet. The joke satirizes grandiose rhetoric and the desire to fix everything, suggesting that even sincere idealism can collide with practical limits. Its humor comes from the sudden shift from moral aspiration to bodily, mundane logistics, a hallmark of Kaplan’s cerebral, misdirection-driven style.