Paddy is about to go into the bar for a little refreshment when he hears someone yelling "Do not go into that house of sin!"
He turns around on the point of telling the interfering busybody to feck off, but he holds his tongue when he sees that it is a nun, and instead he lifts his hat politely and says "Why must I not go in there, holy sister?"
"Because," rages the nun, "it is the devil's brew that they are selling in there!"
"Well," says Paddy, "and how would you be knowing that? Have you ever tried it? No? Well then, sister, is it fair to condemn that which you do not know?"
She appears to be about to scold him again, but checks herself. "Well now, since you put it that way -- no, indeed I have not. But that doesn't matter!"
Paddy nods his head politely, and says "Perhaps you are right, sister. Or perhaps you should put it to the test, and then you would see that it is not such terrible stuff as all that, after all."
"Well now," the nun says, "but I cannot be seen going into a place like that!"
"All right," says Paddy, "I'll bring a drop out to you, for the sake of your good name."
"Very well," says the nun. "But let it look like water, and you shall bring it in a teacup, lest some weak-minded soul see a nun drinking in the street and be led into sin."
"No problem," says Paddy; and he goes inside and up to the bar, and says "A pint of Guinness please, mine host, and a whiskey chaser... and could I please have a double gin in a teacup?"
And the barman blinks and says "Jay-zus! Is that feckin' nun back again?"