Once upon a time there was this man who had a dog. He came home one day and found his dog belly up with its legs sticking up in the air. He wasn't too sure if the dog was dead or not, so he took it down to his vet. He told the vet the problem, and the vet said that there was a sure-fire way to see if the dog was indeed dead. The vet left the room and returned with a cat. He rubbed the cat around in the dogs face, and after a while came to the conclusion that the dog was indeed dead. The man got very upset and asked the doctor how much he owed him, to which the doctor replied, "$550". The man was stunned and asked the doctor to explain the outrageous fee. The doctor said, "$50 was for the visit, and $500 was for the cat-scan".