Benvolio tries to prevent Mercutio from fighting by stating “I'm begging you, Mercutio, let's go home. It's hot outside, and the Capulets are wandering around. When it's hot outside, people become angry and hot-blooded”. This leads to an argument where Mercutio declares: "You would fight with a man if he had one more whisker or one less whisker in his beard than you have in your beard”. What kind of irony is Mercutio using when he teases Benvolio?