So the novice young nun escapes the convent, goes into town, walks into the liquor store and nonchalantly asks for a fifth.
The counter clerk, somewhat taken aback, recovers himself and asks, "Uh...er...Sister, are you sure the Mother Superior will approve?"
The nun leans close and whispers confidentially, "Actually, it IS for the Mother Superior. For her constipation, you understand."
Clerk: "OH! Sorry! Say no more. Here you go."
Couple hours later, at closing time, he locks up the shop, starts to walk down the street -- and right around the corner spies the young Sister sitting on the sidewalk, propped up against a doorstep, clutching the empty bottle and completely blotto.
Shocked clerk: "SISTER! Look at you! And you said that was for the Mother Superior's constipation!"
Very sloshed Sister: "But it is. When she sees me like this, she's gonna shit!"