Free coffee, using curse words, talking fast, getting you to say yes to one thing, getting too friendly, and figuring out your type and adapting the sales pitch are all techniques of trying to convince you to buy a product which sometimes works.
This link to cracked.com gives the details.
http://www.cracked.com/article_19071_6-real-world-jedi-mind-tricks-salesmen-are-using-you.html
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