Because it’s a “famous” (in our circles) quote. You might prefer this one:

> There’s two hard problems in computer science: We only have one joke and it's not funny.

There are at least one more joke:

"There is 10 kinds of people, those who can read binary and those who can't."

Personally I prefer the cache invalidation one.

	▲	latexr 3 hours ago \| parent [-]
		> "There is 10 kinds of people, those who can read binary and those who can't." I like the continuation (which requires knowledge of the original): “And those who didn’t expect this joke to be in base 3”.