In the early 20th century, a man traveled the world. One day, he stopped at a hotel, rented a room, and went to sleep. At night, he woke up, lay there for 5 seconds, then got out of bed, called the front desk, and said that there was a corpse in his room. How did he know?
Was the corpse already in the room when the man entered?
Did he lie to the front desk?