Sister Mary Catherine lived in a convent, a block away from Jack's liquor store. One day, in walked Sister Mary Catherine and she said, "Oh Jack, give me a pint o' the brandy."
"Sister Mary Catherine," exclaimed Jack, "I could never do that! I've never sold alcohol to a nun in my life!"
"Oh Jack," she responded, "it's only for the Mother Superior." Her voice dropped. "it helps her constipation, you know."
So Jack sold her the brandy.
Later that night Jack closed the store and walked home. As he passed the convent, who should he see but Sister Mary Catherine. And she was hammered. She was singing and dancing, whirling around and flapping her arms like a bird, right there on the sidewalk.
A crowd was gathering so Jack pushed through and exclaimed, "Sister Mary Catherine! For Shame! You told me this was for the Mother Superior's constipation!"
Sister Mary Catherine didn't miss a beat as replied: "And so it is me lad, so it is. When she sees me she's going to shit!"
