World's Shortest Joke

Noam Chomsky: “Three short steps in [a] led in by three alphabetically consecutive consonants [k,l,m], occlusive, liquid, labial, respectively (that is, progressing from posterior to anterior buccal cavity), act as a ladder, rising to the highest note in the English register [u], which slides in on us over the glistening parquet of the soft sibilant [z], puckering up the mouth in gentle mockery of itself.”