In front of the door, a large mirror was mounted, and a voice came out of it. “On my instructions,” the voice said, “you may now remove your mask, open your mouth, and test for yourself whether you are indeed hypochondriacs or not. Is everything all right? Do you experience any peculiar symptoms?” “Well . . .” “Precisely,” the voice said. “And now tell me if these pills work and whether you are suffering. These symptoms are far more dangerous. Therefore, unless otherwise indicated, all hypochondriacs should be extremely cautious when taking these pills.” “And who will be responsible for ensuring that they are not poisonous? Who will be the guinea pig?” “I will.”