A lesson in observation and stupidity

First-year students at Auburn University were attending their first lecture
in a classroom, with a real dead cow. They all gathered around the surgery
table with the body covered by 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.
For an example, the Professor pulled back the sheet, stuck his finger in the
butt of the dead cow, withdrew it and stuck his finger in his mouth. 'Go
ahead and do the same thing,' he told his students.
The students freaked out, hesitated for several minutes. However, eventually
took turns sticking a finger in the butt of the dead cow 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.'