The Death of Polonius

In this scene, Hamlet has killed Polonius.  Polonius was spying on Hamlet's and his mother's conversation.  His mother thought that Hamlet was acting all weird, so she asked him to come and talk to her while Polonius eavesdrops on their conversation.  Polonius made a sound and Hamlet thought it was Claudius spying on them.  He took out his sword and killed the man behind the curtain, but then he found at that it was really Polonius.

Hamlet: I have killed Polonius today.  I am very sorry Polonius.  But you know you had it coming for spying on me and my mother.  I thought you were Claudius.  I am deeply sorry.