Run away Nuns

There are two nuns. One of them is known as Sister
Mathematical (SM) and the other one is 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 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 follow 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: 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........

And those of you who thought it would be
dirty, Pray for forgiveness