A group of tourists, stranded somewhere in the countryside, were given old rations to eat. Before eating the food, they tested it by throwing some of it to a dog who seemed to enjoy it and suffered no ill after effects.

The following day they learnt that the dog had died. Everyone was panic-stricken. Many began to vomit and complained of fever and dysentery. A doctor was called into treat the victims for food poisoning.

The doctor began by asking what had happened to the body of the dog. Enquiries were made. A neighbor casually said " Oh it was thrown in a ditch because it got run over by a car."