What does polonius yell from behind the curtain?

In Shakespeare's "Hamlet," Polonius yells "O, I am slain!" after Hamlet mistakenly stabs him through the arras (the curtain) while thinking he is attacking Claudius. This moment is pivotal, as it reveals Hamlet's impulsive nature and sets off a chain of tragic events. Polonius's death also heightens the tension between Hamlet and Ophelia, further complicating the play's themes of madness and betrayal.