I'll have these players Play something like the murder of my father Before mine uncle: I'll observe his looks; I'll tent him to the quick: if he but blench, I know my course. The spirit that I have seen May be the devil: and the devil hath power To assume a pleasing shape; yea, and perhaps Out of my weakness and my melancholy,-- As he is very potent with such spirits,-- Abuses me to damn me: I'll have grounds More relative than this.--the play's the thing Wherein I'll catch the conscience of the king.