Why does claudius jump up while watching the play?

In William Shakespeare's play "Hamlet," Claudius jumps up while watching the play because he is overcome with guilt and remorse. The play, which is performed by a troupe of actors, depicts the murder of King Hamlet, Claudius's brother, by Claudius himself. As the actors reenact the crime, Claudius is deeply affected by the portrayal of his own actions and the consequences they have had. He is unable to control his emotions and physically reacts by leaping up from his seat.

His sudden movement is a physical manifestation of his inner turmoil and shame. It also highlights the contrast between the public persona he must maintain as king and the private guilt that haunts him. Claudius's jump is a pivotal moment in the play, as it marks a turning point in his character's journey. It sets the stage for his eventual confrontation with Hamlet and the revelation of his guilt to the world.