What is a famous play on words example in literature?

A famous play on words example in literature is the phrase “ask for me tomorrow and you shall find me a grave man,” spoken by Mercutio in Shakespeare’s Romeo and Juliet (Act 3 Scene 1).

Here, “grave” has a double meaning, namely “serious” and “burial place.” The fatally wounded Mercutio suggests that they will find him to be a man in his grave.