The Late Night Watchman
Here we go.
An off duty policeman is working as a night watchman in an office building.
He's doing his nightly rounds, and he comes to a closed door. Behind the door, he hears voices.
He hears people talking, and an argument seems to be taking place. Raised voices, and yelling. Then he hears one of them say, "No, Frank! No, don't do it. You'll regret it."
And then he hears what sounds like gun shots. Bang, bang, bang.
He burst through the door. What does he see? A dead man on the floor, and the proverbial smoking gun.
Now, in the room there are three living people. A minister, a doctor and a plumber.
He walks over to the minister and says, "You're under arrest. You have the right to remain silent."
How does he know that it was the minister that pulled the trigger?
