Question

Which of the following, spoken by Mercutio as he dies, is an example of a pun?

Lady, by younger blessed moon I swear
Ask for me tomorrow, and you shall find me a grave man
No, tis not so deep as a well
Why the devil came you between us?

Answer 1

Definitely "Ask for me tomorrow, and you shall find me a grave man." because the word 'grave' can mean two things; 
1: the place of burial for a dead body; and 
2: heavy, serious, or with solemnity

Answer 2

Its B Im sure of it.