I have of late,—but wherefore I know not,—lost all my mirth, forgone all custom of exercises; and indeed it goes so heavily with my disposition that this goodly frame, the earth, seems to me a sterile promontory; this most excellent canopy, the air, look you, this brave o’erhanging firmament, this majestical roof fretted with golden fire, why, it appears no other thing to me but a foul and pestilent congregation of vapours.
Seems that Hamlet has gone a bit nutso. Which causes no small amount of dismay among those who know him best.
Rosencrantz and Guildenstern, Hamlet’s childhood friends, are called by the king and queen to sort out things out. It occurred to me at this point that he might be trying to pull a fast one and indeed, it turns out that this is the case. Hamlet is crazy like a fox and proceeds to cook up a plot to rat out the new king.