Two elderly builders go into the pub after a hard day’s work.

They’re sat drinking for a while when a very smartly dressed man walks in and orders a drink.

The two begin to speculate about what the man does for a living.

“I’ll bet he’s an accountant,” said the first builder.

“Looks more like a stockbroker to me,” argued the second.

They continued to debate the subject for a good while until eventually the first builder needed to use the toilet.

On walking in, he saw the smartly dressed man standing at a urinal.

“Excuse me mate, but me and my friend have been arguing over what a smartly dressed fella like you does for a living?” the builder asked.

The man smiled and replied, “I’m a logical scientist.”

“A what?” asked the builder.

“Let me explain,” the man continued. “Do you have a goldfish at home?”

A bit puzzled but intrigued, the builder answered, “Yes, I do as it happens.”

“Well, then it’s logical to assume that you either keep it in a bowl or a pond. Which is it?”

“A pond,” the builder replied.

“Then it’s logical to assume you have a large garden.”

The builder nodded.

“Which means it’s logical to assume you have a large house.”

“I have a six-bedroom house that I built myself,” the builder said proudly.

“Given that, it’s logical to assume that you’re married…”

“Yes, I’m married and we have three children.”

“Then it’s logical to assume you have a healthy sex life.”

“Five nights a week!” the builder boasted.

The man smiled, “Therefore it’s logical to assume you don’t masturbate often.”

“Never!” the builder exclaimed.

“There you have it,” the man concluded. “That’s logical science at work.”

The builder returned to the bar, clearly impressed.

The other builder asked, “Did you find out what that smart bloke does?”

“Yeah,” replied the first, “he’s a logical scientist.”

“A what?” asked the second.

“Let me explain,” said the first builder. “Do you have a goldfish at home?”

“No,” replied his mate.

“Well, you’re a wanker then!”