Two nuns went out of their convent for a walk. One of them is

known as Sister Mathematical (SM) and the other one is known

as Sister Logical (SL). It was getting dark and they were still

far away from the convent.

SL: Have you noticed that a man has been following us for the

past half-hour?

SM: Yes, 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 15 minutes at the

most. What can we do?

SL: The only logical thing to do 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 follows us both. So the man

decided to follow Sister Logical.

Sister Mathematical arrives at the convent and is worried 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........

The format is quite amusing, only falls down a bit on the punchline.