Two nuns went out of their convent to sell cookies. One of them was known as Sister Mathematical and the other one was known as Sister Logical. It was getting dark and they were still far away from the convent.

Sister Logical: Have you noticed that a man has been following us for the past half-hour?

Sister Mathematical: Yes, I wonder what he wants.

Sister Logical: It's logical. He wants to rape us.

Sister Mathematical: Oh, no! At this rate he will reach us in 15 minutes at the most. What can we do?

Sister Logical: The only logical thing to do, of course, is to walk faster.

Sister Mathematical: It's not working.

Sister Logical: Of course it's not working. The man did the only logical thing. He started to walk faster too.

Sister Mathematical: So, what shall we do? At this rate he will reach us in one minute.

Sister Logical: 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 arrived at the convent and was worried about what had happened to Sister Logical. Then Sister Logical arrived, breathless and flushed.

Sister Mathematical: "Sister Logical! Thank God you are here! Tell me what happened!"

Sister Logical: The only logical thing happened. The man couldn't follow us both, so he followed me.

Sister Mathematical: Yes, yes! But what happened then?

Sister Logical: I started to run as fast as I could and he started to run as fast as he could.

Sister Mathematical: And?

Sister Logical: The only logical thing happened. He reached me.

Sister Mathematical: Oh, dear! What did you do?

Sister Logical: The only logical thing to do. I lifted my dress up.

Sister Mathematical: Oh, Sister! What did the man do?

Sister Logical: The only logical thing to do. He pulled down his pants.

Sister Mathematical: Oh, no! What happened then?

Sister Logical: Isn't it logical, Sister? A nun with her dress up can run much faster than a man with his pants down........