"Don't go in there! It's a sin to drink! Don't be a sinner! Booze is evil!" a Nun shouts at a man as he's about to enter a pub.
He takes exception to her demands, and asks her, "How do you know drinking is so bad? Have you ever had a drink of any kind of booze?"
She replies that no, she hasn't.
"Then how do you know it's so bad and evil?"
"Fair enough. Maybe you could get me a little drink, and I'll see for myself?"
"Sure. What would you like?"
The Nun tells him that she's heard of something called 'gin', so she'll try that. Also, she can't bring herself to go inside the pub, so could he put her drink in a cup and bring it outside to her?
"Okay. I'll be right back," the man tells her.
The man goes inside the pub and approaches the bartender.
"Yes, sir, what can I get you?"
"I have a bit of an odd request. I'd like a rum and Coke for myself, and could I get a gin, but have it in a cup?"
"Yes, sir. One rum and Coke and a gin...in a cup? Wait a sec! Is that bloody nun outside my pub again?!"