Although Hamlet exults at the success of his stratagem, interpreting Claudius’s interruption isn’t as simple as it seems. In the first place, Claudius does not react to the dumbshow, which exactly mimics the actions of which the ghost accuses Claudius. Claudius reacts to the play itself, which, unlike the dumbshow, makes it clear that the king is murdered by his nephew. Does Claudius react to being confronted with his own crimes, or to a play about uncle-killing sponsored by his crazy nephew? Or does he simply have indigestion?
Hamlet appears more in control of his own behavior in this scene than in the one before, as shown by his effortless manipulations of Rosencrantz and Guildenstern and his frank conversation with Horatio. He even expresses admiration and affection for Horatio’s calm level-headedness, the lack of which is his own weakest point: “Give me that man / That is not passion’s slave, and I will wear him / In my heart’s core, ay, in my heart of heart, / As I do thee” (III.ii.64–67). In this scene he seems to prove that he is not insane after all, given the effortlessness with which he alternates between wild, erratic behavior and focused, sane behavior. He is excited but coherent during his conversation with Horatio before the play, but as soon as the king and queen enter, he begins to act insane, a sign that he is only pretending. His only questionable behavior in this scene arises in his crude comments to Ophelia, which show him capable of real cruelty. His misogyny has crossed rational bounds, and his every comment is laced with sexual innuendo. For instance, she comments, “You are keen, my lord, you are keen,” complimenting him on his sharp intellect, and he replies, “It would cost you a groaning to take off my edge” (III.ii.227–228). His interchange with Ophelia is a mere prelude to the passionate rage he will unleash on Gertrude in the next scene.