Question: A police officer was walking outside of a diner. He heard somebody yell inside the diner "No, John not the gun," followed by a gun shot. The officer immediately ran inside and found a milkman, a doctor, a lawyer, and the dead body. The cop immediately arrested the milkman.
How did the officer know the milkman man did it?
Answer: The doctor and lawyer were both women and the milkman was named John.