PUN- Play on words.

An exchange of words between Mercutio and Romeo, discussing, well...if you get it, you get it

Romeo: Why then is my Pump well flowr'd.

Mercutio: Sure wit, follow me this ieast, now till thou hast worne out thy Pump, that when the single sole of it is worne, the ieast may remaine after the wearing, sole- singular.

-Act 2, Scene 4