Two nuns, one known as Sister Mathematical (SM) and the other known as Sister Logical (SL), went in to town to sell cookies. As it was getting dark, they were returning home, but still far from the convent.
SL: Have you noticed that man following us for the past half-hour?
SM: Yes, I wonder what he wants.
SL: He wants to rape us. It is the logical thing.
SM: Oh, no! At this rate he will reach us in 15.2 minutes. What can we do?
SL: The only logical thing to do of course is that we have to start walking faster.
SM: It is not working.
SL: Of course it is not working. The man did the only logical thing. He started walking 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 to split up. You go that way and I will go this way. He cannot follow both of us.
So they split up and the man decided to go after Sister Logical.
Sister Mathematical arrived at the convent and was worried because Sister Logical had not yet arrived. Finally, Sister Logical arrived.
SM: Sister Logical! Thank God you are here! What happened with the man? Are you all right?
SL: I am fine. The logical thing happened. The man could not follow both of us, and you are faster, so he followed me.
SM: So, what happened then?
SL: The only logical thing. I started to run as fast as I could.
SM: So what happened?
SL: The only logical thing. The man also started to run as fast as he could.
SM: And then?
SL: The only logical thing. He was faster, so he caught up with me.
SM: Oh, no! What did you do then?
SL: The only logical thing I could do. I lifted my dress up.
SM: You did? 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: The only logical thing. A slow nun with her dress up can run a lot faster than a fast man with his pants down.