First-year students at Med school were receiving their first
anatomy class, with a cadaver. They all gathered around the
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 you not be disgusted by anything involving the body. For example,
the Professor pulled back the sheet, stuck his finger in the anus
of the cadaver, withdrew it and stuck it in his mouth. 'Go ahead and do
the same thing,' He told his students.

The students freaked out, and hesitated for several minutes. But eventually
they all took turns sticking a finger in the anal opening of the dead body and
sucking on it.

When everyone finished, the Professor looked at them and said, 'The second
most important quality is observation. I stuck in my middle finger and
sucked on my index finger. Now learn to pay attention. Life's tough, it's
even tougher if you're stupid.'