Two nuns are walking down the street when they notice that a man is following them.

Sister Michael, the older and wiser nun, says to the young and naïve Sister Patrick, "See that crossroad ahead? You go left and I'll go right: he can't follow us both. We'll meet back at the Abbey."

So the sisters part and the man follows Sister Michael.

Some time later, Sister Patrick is anxiously waiting at the Abbey when Sister Michael returns alone.

"Thank the Lord you are alright!", exclaims Sister Patrick. "But what happened to that man?

"Well," replies Sister Michael, "After a few minutes, I stopped and pulled up my dress."

Sister Patrick stares in shock.

"Then," continues Sister Michael, "he stopped and pulled down his trousers."

Sister Patrick gasps. "Oh Sister, why would you let him do that?"

"Because," explains Sister Michael, "a nun with her dress up can run faster than a man with his trousers down!"

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Thanks to my English teacher for telling my class this when we were 13.