Keeping true faith to Polonius, who famously noted that the soul of wit is brevity, herewith the wittiest poem ever penned in the US, and possibly in the English language:
"Pouring ketchup from the bottle, "None'll come, and then a lot'll."
-- Ogden Nash
-------- Uh, oh. I screwed up. That couplet can't POSSIBLY be a poem because A) it rhymes and B) its metric structure is consistent.