The scene is just before the play where Hamlet is giving some advice to the actors of the play as to not be too over dramatic but make sure they show enough emotion. Hamlet tells Horatio that the play will re-enact the killing of his father and that he is testing Claudius’s guilt, Horatio agrees to look at Claudius’s reaction. The play, The Mousetrap, gets underway and when the murder scene happens, Claudius calls for lights out. Hamlet and Horatio are convinced that the king is guilty. Polonius enters and tells Hamlet that he should go speak with his mother.