An officer is sent to investigate an apparent suicide. There is a man on the ground, who is believed to have jumped from the ten story building. The officer goes into the building to the first floor in front of the body, and opens the window and throws a coin down to the body. She does this same exact process on every floor, other than the roof, which has no stairs and the elevator doesn't lead to. No ladder either. She goes down and says that the man had been murdered. She is correct, but how did she know?
