First-year students at the Med School were receiving their first anatomy class with a real dead human body. They all gathered around the surgery table with the body covered with a white sheet.
The professor began the lecture by telling them, "In medicine, it is necessary to possess two important qualities as a doctor. The first is that you not be disgusted by anything involving the human body."
To illustrate, he pulled back the sheet, stuck his finger in the anus of the corpse, withdrew it, and stuck it in his mouth.
"Go ahead and do the same thing," he told his students. The students freaked out, hesitated for several minutes, but eventually tool turns in sticking a finger in the butt of the dead body 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."
There were two nuns... One of them was known as Sister Mathematical (SM), and the other one was known as Sister Logical (SL).
It is getting dark and they are still far away from the convent.
SM: "Have you noticed that a man has been following us for the past thirty-eight and a half minutes? I wonder what he wants."
SL: "It's logical. He wants to rape us."
SM: "Oh, no! At this rate he will reach us in fifteen minutes at the most! What can we do?"
SL: "The only logical thing to of course is to walk faster."
SM: "It's not working."
SL:"Of course it's not working. The man did the only logical thing. He started to walk faster too."
SM: "So, what shall we do? At this rate he will reach us in one minute."
SL: "The only logical thing we can do is split. You go that way and i'll go this way. He cannot follow us both."
So the man decided to follow Sister Logical.
Sister Mathematical arrives at the convent and is worried about what has happened to Sister Logical.
Then Sister Logical arrives.
SM: "Sister Logical! Thank God you are here! Tell me what happened!"
SL: "The only logical thing happened. The man couldn't follow us both, so he followed me."
SM: "Yes, yes! But what happened then?"
SL: "The only logical thing happened. I started to run as fast as I could and he started to run as fast as he could."
SM: "And?"
SL: "The only logical thing happened. He reached me."
SM: "Oh, dear! What did you do?"
SL: "The only logical thing to do. I lifted my dress up."
SM: "Oh, Sister! What did the man do?"
SL: "The only logical thing to do. He pulled down his pants."
SM: "Oh, no! What happened then?"
SL: "Isn't it logical, Sister? A nun with her dress up can run faster than a man with his pants down."