A woman took her pet duck to the vet's. The vet examined the duck and pronounced it dead.
The lady was clearly distressed and asked for a second opinion. The vet was very understanding, and briefly left the room before returning with a Labrador retriever.
The dog sniffed the duck, licked it and gave it a prod with his paw. Then he looked at the vet and shook his head.
The poor woman would still not accept that her cherished pet was dead.
The vet disappeared again and came back with a tabby cat. The cat pawed the duck a few times, cocked an ear at it, then meowed and shook her head at the vet.
The vet said he was sorry but there was absolutely no doubt that the duck was dead, extinct, deceased, no more, and presented his bill for £150.
The owner was aghast - "£150 to me my duck is dead! That can't be right!"
"Well", said the vet "had you taken my word for it, it would have been £20, but with the lab report and the cat scan..."