Students at the Med School were receiving their first anatomy class
with a real dead human body. They are all gathered around the surgery
table with the body covered with a white sheet.

Then the professor started the class by telling them:

"In medicine, it is necessary to have 2 important qualities as a
doctor:
The first is that it is necessary that you not be disgusted."
The Professor uncovered the sheet, sunk his finger in the ass of
the dead body, withdrew it and sucked it.

"Go ahead and do the same thing," he told his students.

The students freaked out, hesitated and subsequently taking
turns, sunk their finger in the ass of the dead body and sucked it after
withdrawing it.

When everyone finished, the Professor looked at them and told
them:
"The second important quality is observation. I sunk the middle
finger and sucked the index. Pay attention people!!!"