Lord of the Underworld

The community where I live is haunted. At twelve o'clock every night, all residents must smile into the cat's eye. A person who cannot smile will turn into a corpse grinning from the corners of his mouth to his ears the next day. I laughed according to the rules for seven days, and finally waited until someone from the Anomaly Administration came to my door. They looked at me with pale faces: "Are you... A human?"