Riddle: A criminal finds out that a doctor digs dead convicts out of their grave to examine their bodies. He figured this would be a great way to escape prison. When no one was looking, he runs to one of the dead convicts' coffin and sneaks in. About 30 minutes after getting buried, the criminal grew impatient. He grabbed a torch out of his pocket and lit it to see who was next to him. He looked to the side and screamed. Why does the criminal scream?