Two nuns go out of the convent to sell cookies in the village. One of them is known for her mathematical mind [SM]; the other, for her logical mind [SL]. It is getting dark, and they decide to return to the convent.

SL: Have you noticed a man following us for the past half-hour?

SM: Yes, Sister. I wonder what he wants.

SL: It's logical. He wants to rape us.

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

SL: The only logical thing to do, of course. We have to start walking faster.

So, they walk faster.....

SM: It is not working!

SL: Of course, it's not working. The man did the only logical thing to do: He also started to walk faster.

SM: So, what shall we do? At this pace, he will reach us in less than a minute.

SL: The only logical thing we can do is to split. You go that way, and I will go this way. He cannot follow both of us.

And so, the man decides to go after SL.

SM arrives at the convent and is worried because SL has not arrived yet.

Finally, SL arrives.

SM: Sister, Thank God, you're back! Tell us, what happened?

SL: The only logical thing happened. The man could not follow both of us, so he decided to go after me.

SM: So, what happened. Please tell us.

SL: The only logical thing to happen. I started to run as fast as I could.

SM: And then?

SL: The only logical thing to happen: The man also started to run as fast as he could.

SM: What else?

SL: The only logical thing to happen: He reached me.

SM: Oh, no! What did you do then?

SL: The only logical thing to do: I took my dress up.

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

SL: The only logical thing to do: He put down his pants.

SM: Lord, Jesus! What happened then?

SL: Isn't it logical, Sister? A nun with her dress up runs faster than a man with his pants down.