A woman brought a very limp duck into a veterinary surgery clinic. She laid
her pet on the table; the vet pulled out his stethoscope and listened to
the bird's chest. After a moment or two, the vet shook his head slowly and
said, "I am sorry, your duck has passed away."
The  distressed owner wailed, "Are you sure?" "Yes, I am quite sure. The
duck is dead," he replied.
"How can you be so sure," she protested. "I mean, you haven't done any
testing on him or anything. He might just be in a coma or something."
The vet rolled his eyes, turned around and left the room and returned a few
moments later with a black Labrador Retriever. As the duck's owner looked
on in amazement, the dog stood on his hind legs, put his front paws on the
examination table and sniffed the duck from top to bottom. He then looked
at the vet with sad eyes and shook his head. The vet patted the dog and
took it out, and returned a few moments later with a cat. The cat jumped up
on the examination table and also sniffed delicately at  the bird. The cat
sat back on its haunches, shook its head, meowed softly and strolled out of
the room.
The vet looked at the woman and said, "I am sorry, but as I said, this is
most definitely, 100% certifiably, a dead duck." Then the vet turned to his
computer terminal, hit a few keys and produced a bill, which he handed to
the woman.
The duck's owner, still in shock, took the bill. £150!!!!," she cried.
£150 just to tell me my duck is dead?!!!"
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The vet shrugged. "I'm sorry. If you'd taken my word for it, the bill would
have been £20, but with the Lab Report and the Cat Scan, it's now £150."