Princeton Medical School students were receiving their first anatomy class with a real dead human body. They were all gathered around the surgery table with the body covered with a white sheet. The professor started the class by telling them, “In medicine, it is necessary to have two important qualities as a doctor – the first is that it is necessary that you not be disgusted.”
The professor uncovered the body, stuck his finger in the butt of the dead body, withdrew it and sucked his finger.
“Go ahead and do the same thing.” he told his students.
The students freaked out, hesitated and subsequently taking turns sticking their fingers in the butt of the body and sucking their finger after withdrawing it from the rectum.
When everybody was finished, the professor looked at them and told them, “The second important quality is observation. I stuck my middle finger in and sucked my index finger. Pay attention people!!!!!”