A guy is driving around in his Porsche in the countryside. He stops outside a field full of sheep, walks up to the shepherd and says "I've got an offer. I'll guess how many sheep you've got in this field, and if I guess right, I get to take a sheep with me, and if I guess wrong, you get my car."

Shepherd thinks he's on to a sure thing and agrees.

"137" says the driver.

"Damn me, you're right.", says the shepherd and dutifully hands over a sheep.

The man walks away, stuffs the sheep in his car, and is about to drive away when the shepherd knocks on his window.

"I've got a proposal for you. If I can guess what you do for a living, I get to take your car. If I'm wrong, you can have all my sheep."

"Done", says the driver.

"You're a consultant.", says the shepherd.

"Bloody hell, how did you guess?"

"Easy. You come in here uninvited, you tell me what I already know, and then you charge me for it."

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