What does Jesse do that startles his sisters and causes Brenda to say, “You don’t even care, do you?”

99 Red Ballons

Lady Macbeth is startled by the sound of a scream, which she interprets as a signal that the murder has taken place. This startles her because it signifies that the plan she orchestrated with Macbeth has been set in motion and there is no turning back.

He steps into Scrooge's bedroom while Scrooge is a asleep and startles him.

Rainsford hears a pistol shot from the right