Up front apology - not the best timing for an Aggie bit - but this came across my desk before and I have not seen it before so I thought I would share just in case.  Hook Em!

First-year students at Texas A&M's 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 body".

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, 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."