"Just To Prove A Point" joke
As a man was about to enter a bar, a nun on the step outside accosted him.
"Young man, surely you don't intend to waste your hard-earned money on the devil's brew by entering this den of iniquity," scolded the nun. "Why don't you go home and feed and clothe your wife and children."
"Hold on, Sister," argued the man. "How can you form such a rash judgment and condemn alcohol so quickly, when you've never tasted it?"
"Very well, young man," the nun replied, "I will taste it, just to prove my point. Obviously, I'm not able to enter the bar, so why don't you bring me some whiskey. Oh, and in order to camouflage my intent, perhaps it would be best if you brought it in a cup, rather than a glass!"
Agreeing, the man entered the bar and said to the barkeep, "I'll have a large whiskey. Oh, and could you put it in a cup?"
"Good grief," exclaimed the bartender, "Sister Rose is outside again, isn't she?"
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