The Tragedy of Hamlet, Prince of Denmark (Act 4, Scene 1) William Shakespeare

                                                    ACT IV.

                                                    Scene I.

                                  Elsinore. A room in the Castle.

Enter KING and QUEEN, with ROSENCRANTZ and GUILDENSTERN.

  KING
There's matter in these sighs. These profound heaves
You must translate; 'tis fit we understand them.
Where is your son?

  QUEEN
Bestow this place on us a little while.

                                                      [Exeunt Rosencrantz and Guildenstern.]

Ah, mine own lord, what have I seen to-night!

  KING
What, Gertrude? How does Hamlet?

  QUEEN
Mad as the sea and wind when both contend
Which is the mightier. In his lawless fit
Behind the arras hearing something stir,
Whips out his rapier, cries 'A rat, a rat!'
And in this brainish apprehension kills
The unseen good old man.