Ned goes over to see his neighbour who has a very ferocious-looking dog. As Ned approaches the door the dog begins to bark wildly and his
neighbour says to him, "Come on in, Ned! Don't be afraid of my dog. You know the old proverb: A barking dog never bites." "Yes," replied Ned, "I know the proverb, and you know the proverb,
but does your dog know it?" Before we have an agreement on when a dog can bite and when it cannot, we must first make sure the dog is party
to the agreement.