According to Bartlett’s Quotations, the shortest poem in the English language is called “On the Antiquity of Microbes.” It goes like this– “Adam / Had ’em.”
Yup, that’s a short-ass poem.
Reportedly, Muhammad Ali trumped (sorry, no other term comes to mind) that poem with — “Me? / Whee!!” , as witnessed by renown poet Marianne Moore and The Paris Review editor, George Plimpton.