During a temporary shutdown of operations at a large plant, trained police dogs were hired to protect the building from vandalism. A company executive who was unaware of the new regime arrived at the plant early one morning.

As he was walking down the corridor to his office, he came face to face with one of the dogs, accompanied by his trainer.

The dog reacted to the presence of the stranger by baring his teeth and uttering a menacing growl. The executive froze to the spot. The trainer shouted in an authoritative tone the command: "Sit!"

The unnerved executive promptly sat down on the floor.