Along the same lines...A guy is driving around in his BMW in the countryside.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. Man walks away, stuffs sheep in 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, counting up the number of nights he could be kept happy with 137 sheep. "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. Now give me back my dog."