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5 doctors

   Five doctors went duck hunting one day. Included in the group
 were a general practice (GP) physician, a pediatrician, a
 psychiatrist, a surgeon and a pathologist.  After a time, a
 bird came winging overhead. The first to react was the GP who
 raised his shotgun, but then hesitated.
 "I'm not quite sure it's a duck," he said, "I think that I will
 have to get a second opinion."  And of course by that time, the
 bird was long gone.
   Another bird appeared in the sky thereafter. This time, the
 pediatrician drew a bead on it. He too, however, was unsure
 if it was really a duck in his sights and besides, it might have
 babies.  "I'll have to do some more investigations," he muttered,
 as the creature made good its escape.
   Next to spy a bird flying was the sharp-eyed psychiatrist.
 Shotgun shouldered, he was more certain of his intended
 prey's identity.
  "Now, I know it's a duck, but does it know it's a duck?" The
 fortunate bird disappeared while the fellow wrestled with this
 dilemma.
   Finally, a fourth fowl sped past and this time the surgeon's
 weapon pointed skywards.  BOOM!!  The surgeon lowered his
 smoking gun and turned nonchalantly to the pathologist
 beside him.
   "Go see if that was a duck, will you?"