First-year students at the Texas A & M Vet School were
attending their first anatomy class with a real dead cow.
They all gathered around the surgery table with the body
covered with a white sheet.

The professor started the class by telling them
"In veterinary medicine it is necessary to have two
important qualities as a doctor.
The first is that you not be disgusted by anything involving
the animal's body."

For an example, the professor pulled back the sheet,
stuck his finger in the butt of the 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, but 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 but it's even
tougher if you're stupid."