its sunday and a woman reports her husband murdered. an investigator comes and interviews the house hold (there is a maid, pool boy, personal trainer, cook, and butler.) each gives what they were doing that the time of the murder, the maid was getting the mail, the pool boy was cleaning the pool, the personal trainer was working out, the cook was cooking in the living room butler was dusting the living room... the investigator instantly knew who did it and arrested the culprit. who was it and how did he know?