Last weekend, I was sitting outside my local pub, enjoying a quiet pint and generally feeling good about myself, when a nun suddenly appears at my table and starts decrying the evils of drink.

"You should be ashamed of yourself young man! Drinking is a Sin! Alcohol is the blood of the devil!" she shouted at me.

Now I got pretty annoyed about this, and went on the offensive. "How do you know this, Sister?" I said.

The nun said "My Mother Superior told me so."

I replied "But have you ever had a drink yourself? How can you be sure that what you are saying is right?"

She said "Don't be ridiculous. Of course I have never taken alcohol myself."

I then said to her "Then let me buy you a drink - if you still believe afterwards that it is evil, I will give up drink for life."

She thought about this for a moment, and said "How could I, a nun, sit outside this public house drinking?!"

"Well", I said, "I'll get the barman to put it in a teacup for you, then no one will ever know."

The nun reluctantly agreed, so I went inside to the bar. "Another pint for me, and a triple vodka on the rocks" I said. Then I lowered my voice and said to the barman, "Could you put the vodka in a teacup?"

He looked at me, and said "Oh no! It's not that Nun again, is it?"