The most memorable image of Polonius in Shakespeare's Hamlet is the image of him as a corpse being eaten by worms.
In Act 4.3.19-24 Hamlet tells Claudius where Polonius is:
Not where he eats, but where 'a is eaten. A certain convocation of politic worms are e'en at him. Your worm is your only emperor for diet. We fat all creatures else to fat us, and we fat ourselves for maggots. Your fat king and your lean beggar is but variable service--two dishes, but to one table. That's the end.
The king appears shocked, and Hamlet continues:
A man may fish with the worm that hath eat of a king, and eat of the fish that hath fed of that worm.
Hamlet is ridiculing Polonius, here, as well as the king. Polonius was a nosey, arrogant blowhard and Hamlet shows his great disrespect for him with this image. These lines are filled with other images, as well, and display Hamlet's wit and cleverness. They also display his obsession with death.
He conludes the first passage with a pun. That is the end of Polonius, the end we all eventually arrive at, and the end of that short speech. And this is the end of my answer.