Before class begins, the professor asks the student why he hasn't come to class. The student explains that he fell off his bicycle and that his left hand has been trying to kill him. He has rented a house next to the university and plans to move in tonight. The professor asks if the hammer was left by the previous tenant or if it is locked in the locked room. He wonders if there are hidden secrets in the room, and the student answers that he remembers the hammer being in the drawer and that there must be something hidden in the lock. He asks if he can even hold an apple, and wonders why he can't control his hand. He tells the professor that his right hand has replaced his left, and that he has had to cover it with a plaster in order to keep it from acting on its own. The teacher asks him if he has the correct answer to the question, and he answers that the answer is 4.