The Doctor

The doctor conducts his usual medical classes for his 20 trainees at the hospital. One day they gathered at the operation room around a dead patient. Doctor began his lesson saying:"To be a good doctor you must take note of 2 important rules. The first, is to not be disgusted by the human body." As he was saying this he removed the cloth covering the dead body. Then he proceeded to insert his finger into the anus and after that put the finger in his mouth and sucked it. "Now I want all of you to do likewise," he said. So one by one the trainee doctors took turns to insert their fingers into the anus and sucked. When they were done they returned to their original positions. "The second rule," said Doctor,"is that you have to be observant. I PUT MY MIDDLE FINGER INTO THE ANUS BUT I WAS SUCKING MY INDEX FINGER. Now I want all of you to go and wash your mouth."

Moral of the story:
Don't be disgusted by the human body.
And watch what your teacher is doing.