You carry a little money box, your selling encylopedias cost $5000, true value lets say $500. Salesmans commission lets say $850.
* You ask the client does he smoke, the answer is yes, then you guilt trip him by saying "this beautiful set of encylopedias which will aid your sons entrance into Harvard, will only cost you 10 cigarettes a day" and, "are you aware you can save [produce money box] $4.22 cents a day by giving up 10 cigarettes a day, and this sum will pay for these wonderful, red, vellum bound books - that will grace your home for ever". You then drop some coins in the money box, hand it to him and try not to smile?
[2] Mr Lucky Luciano, I can see you want this lovely new Cadillac, its written all over your face, I've told you we will take your old bullet-ridden sedan from you, check it for fingerprints and dynamite wired to the ignition switch and bury it for you in New Jersey, but, we seem to have a slight problem, you've offered £12000 dollars tops, we want $13750, lets say we agree on $13 000 straight, if I phone my manager now, and if he agrees to drop the price to £13000, can we shake hands on it. You then pick up the telephone and speak to a phoney, a guy sat waiting for your call, who says "try and squeeze him for £13250". Either way your betting on a 2-1 shot.
The list is endless, better to keep it clean and straightforward is my motto, anyone need 3 sticks of dynamite, guaranteed not to have been used.