A group of doctors decide to go on their first duck hunting trip.
While in the blind, a flock of birds fly over head. The psychiatrist jumps up and his fellow doctors yell for him to shoot. He says, “I know they’re ducks, but do they know they’re ducks?”
Later another flock flies over and the internist jumps up. They yell for him to shoot, but he says, “They probably are ducks but I can’t rule out the possibility of whooping cranes or passenger pigeons.”
Yet another flock comes overhead. The radiologist jumps up and his friends yell for him to shoot, but he says, “I think they’re ducks, but a need a few more views to be certain.”
Finally, another flock comes over. Before anyone can say a word, the surgeon jumps up, fires away, birds are falling everywhere. He then turns to the pathologist and says, “Make sure those birds are ducks.”