Students at a Medical School were receiving their first anatomy class with a real dead human body.
They are all gathered around the surgery table 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 it is necessary that you must not be disgusted."
The Professor uncovered the sheet, inserted his finger in the ass of the dead body, withdrew it and sucked it. "Go ahead and do the same thing," he challenged his students.
The students freaked out, hesitated and subsequently taking turns, sank their finger in the ass of the dead body and sucked it.
When everyone had finished, the Professor looked at them and said: "The second important quality is observation. I sank my middle finger and sucked the index finger, so please, please pay attention, people!!!"
One of my favourite story I use to open my opportunity meeting. Eddy Chai.