Wondering about those final lines of Mercutio...
What is it about each household exactly that Mercutio's character takes issue with - aside from the fact that their feud got him killed? (Yes, I know I should mention that.) If, for example, the Capulets are demonstrably the more violent, honor-conscious clan (consider Gregory and Sampson at the beginning of the play, the fights that Tybalt starts or brings down upon himself, Papa Capulet's mercurial wrath and rash threats of "disowning" his daughter ("Out, baggage!"), Juliet's willful defiance of her parents' wishes and fierce denunciation of Paris, the fact that Juliet stabs herself at the end) then the Montagues, their foil, could be described, by contrast, as the dreamy pleasure-seekers, flighty, fickle, restless, impulsive, intense but not bellicose, hedonists extraordinaire - except for the fateful moment when Romeo is forced, one could say, out of guilt, out of loyalty, to avenge Mercutio's death. (Interesting that he should feel this imperative on a par with his own love for Juliet...) But with Romeo and Juliet paired off so problematically - even from the outset!- (despite our sympathies for their them), is it not Mercutio's role in the play, even if he be ignorant of R&J as a couple, to show Romeo some third-option of comportment, that he himself embodies beyond what is offered by the Capulets and the Montagues, (mindless honor-seeking/languorous pleasure-seeking) and if so, would not such a path prove somewhat incompatible with these two options? Mercutio - passionate as he is - seems at odds with where these passions lead. His remedy is humor, ridicule and games, yet these are not necessarily intended to help him stay out of danger. On the contrary, he relishes his role as gadfly and antagonist. He ends up dueling with Tybalt! And perhaps he IS in love with someone... But, no doubt, he views these involvements as partial and problematic while holding out for something "other" - more thoughtful, more philosophical. This may seem like quite a stretch, but I see Mercutio as the forerunner to Lear's fool - standing apart from the enthusiasms that surround him, but not entirely free of their influence. His mind remains invulnerable, but alas, not his body.