Two builders (Dave and Stuart) are seated either side of a table in a
rough pub when a well-dressed man enters, orders a beer and sits on a stool at
the bar. The two builders start to speculate about the occupation of the
suit

Dave; I reckon he's an accountant.

Stuart: - No way - he's a stockbroker.

Dave: - He ain't no stockbroker! A stockbroker wouldn't come in here!

The argument repeats itself for some time until the volume of beer gets
the better of Dave and he makes for the toilet. On entering the toilet he
sees that the suit is standing at a urinal. Curiosity and the several beers
get the better of him.

Dave: - 'Scuse me... no offence meant, but me and me mate were
wondering what you do for a living?

Suit: - No offence taken! I'm a Logical Scientist by profession.

Dave: - Oh? What's that then?

Suit: - I'll try to explain by example .. Do you have a goldfish at
home?

Dave: - Er ... mmm ... well yeah, I do as it happens!

Suit: - Well, it's logical that you keep it either in a bowl or in a
pond. Which is it?

Dave: - It's in a pond!

Suit: - Well it's reasonable to suppose that you have a large garden
then?

Dave: - As it happens, yes I have got a big garden.

Suit: - Well then it's logical to assume that, in this town, if you have
a large garden then you have a large house?

Dave: - As it happens I've got a five bedroom house . I built it
myself!

Suit: - Well given that you've built a five bedroom house it's logical
to assume that you haven't built it just for yourself and that you are
quite probably married?

Dave: - Yes I am married, I live with my wife and four children.

Suit: - Well then it is logical to assume that you are sexually active
with your wife on a regular basis?

Dave: - Yep! Five times a week!

Suit: - Well then it is logical to suggest that you don't masturbate
very often?

Dave: - Do what? Not me, mate!

Suit: - Well there you are! That's logical science at work!

Dave: - How's that then?

Suit: - Well from finding out that you had a goldfish, I've told you
about your sex life!

Dave: - I see! That's pretty impressive. Thanks mate!

Both leave the toilet and Dave returns to his mate.

Stuart: - I see the suit was in there. Did you ask him what he does?

Dave: - Yep! He's a logical scientist!

Stuart: - What's that then?

Dave: - I'll try and explain. Do you have a goldfish?

Stuart: - Nope

Dave: - Well then, you're a wanker