Paddy was sitting at a bar when a very well dressed gentleman came and sat down at the same table. After a while they started conversation.

Paddy asked the gentleman what he did for a living. The person replied "I'm Professor of Logic at Dublin University".

"Oh," says Paddy, "What's this here logic?"

"Well," says the Prof., "logic is when things or events follow each other. To give you a demonstration, I've noticed that you have very rough hands. This tells me that you are a manual labourer".

"Dat's roight," says Paddy, "Oi works digging trenches"

"And to carry this one point further, being a manual worker, you would have a big garden shed," says the Prof.

"Dat's roight," says Paddy, "Oi has a big garden shed".

"Well there you are," says the Prof. "Logic . . . one thing follows another in a logical sequence. And to take it one further, if you have a big garden shed, then you would have a big garden".

"Yes, Oi have half an acre at home; vegies for all the family", says Paddy.
"See . . . logical progression . . . one thing follows another. And, to take it one step further, if you have a big garden, you would have a big family", says the Prof.

"Ah, yes, dere is nine in the family," says Paddy.

"There, logical progression," says the Prof. "And, to take it even one step further, if you have a big family, you would be having sex regularly".

"Certainly," Paddy emphasises. "Six nights a week and twice on Sunday".

"Ah, and if you were having sex that regularly, you would not have to masturbate," says the Prof. Oh, never, never, not for many, many years" says Paddy.

"Well," says the Prof., "there you are, logical progression . . . one thing follows another".

With that the Prof. bids farewell to Paddy and leaves the pub.

Patrick, sitting at the bar, then sidles up to Paddy and asks, "Who was that, Paddy?".

"Oh", says Paddy, "That was a very educated gentleman. He's a Professor of Logic at Dublin University".

"Logic?," says Patrick, "What's logic?"

"I'll tell you all about it," says Paddy. "Tell me, Patrick, have you got a big garden shed?"

"Why no," says Patrick.

"Well," says Paddy, "I always thought you were a wanker!!"