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I was receiving my first anatomy class with a real dead human body which was under the sheet.
The professor started the class by telling us, "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 human body."
As an example, the Professor pulled back the sheet, stuck his finger in the butt of the corpse, withdrew it, and stuck his finger in his mouth. "Go ahead and do the same thing," he told us. I was all freaked out, hesitated for several minutes, but eventually we all took turns sticking our finger in the butt of the dead body and sucking on it.
When everyone finished, the Professor looked at us and told us: "The second most important quality is observation. I stuck in my middle finger and sucked on my index finger. Now, learn to pay attention."

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