[mr.miyagi]

First-year students at Med School were receiving their first anatomy
class with a real human body. They all gathered around the surgery
able with the body covered with a white sheet. 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 you not be disgusted by anything involving the
human body." For an example, the Professor pulled back the sheet,
stuck his finger in the butt of the corpse, withdrew it and stuck
it in his mouth.

"Go ahead and do the same thing," he told his students. The
students freaked out, hesitated for several minutes, but
eventually took turns sticking a finger in the butt of the dead body and licking 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 licked on my index finger. Now learn to pay attention."