Likewise, when the Nurse laughingly recounts the lewd joke her husband made when Juliet fell over learning to walk — "Thou wilt fall backward when thou hast more wit" — her earthy humor contrasts with Juliet's adolescent innocence, while simultaneously pointing to Juliet's sexual development from a girl to a woman. Reflecting on the sensual pleasures that await Juliet on her wedding night, the Nurse puns about the likely consequence of pregnancy for her young charge: "I am the drudge, and toil in your delight, / But you shall bear the burden soon at night."
The Nurse's preoccupation with sexual love prevents her from understanding the nature of Juliet's love for Romeo. Even though she fully understands that Juliet is being bartered like livestock, she cannot see that any other social fate could exist for women. So, in Act III, Scene 5, the Nurse advises Juliet to forget Romeo and marry Paris when Capulet demands it. This development of her character further isolates the couple and fuels the tragic consequences of their elevated love. Thus, while the Nurse drives some of the most comedic scenes in the play, within her comic commentaries are woven the subtler threads of tragedy created by enslavement to social conventions.
Shakespeare uses the comic roles of Mercutio and the Nurse to develop the roles of Romeo and Juliet as young tragic lovers. Prior to Tybalt and Mercutio's deaths, the Nurse had served primarily as comic relief. After Mercutio dies, the Nurse's comic role changes to a less sympathetic one — helping to shift the focus to the tragic plight of Romeo and Juliet. Both comic characters' rejection of the ideal of love shared by Romeo and Juliet emphasizes the vulnerable quality of that love and its inability to survive in the world of the play.
