A group of doctors were out duck hunting, when a large bird flew overhead. The family doctor raised his gun to shoot, but then lowered his gun saying, "I am not sure that is a duck."
The Psychiatrist raised his gun, but then lowered it again saying, “I know it's a duck, but I'm not sure that it knows it's a duck."
The surgeon raises his gun and blasts the bird out of the sky. He turns to the pathologist and says, "Go see if that was a duck."
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