Subliminal messaging is illegal in the UK because it breaks the rules of your statutory rights as a consumer to make your own uninfluenced decisions on products. In the US it seems not to work like that, at least if we take a note at this KFC commercial.
This commercial makes your brain processing an image of both the product and a dollar bill. Seeing them together, your brain processes it as 'money= KFC' and so a few days later you might walk past KFC and decide to buy the product. Seemingly of your own choice, but actually you've ended up making a decision that KFC influenced your brain to make.
You can check how real it is here: http://www.youtube.com/watch?v=MunPARnI0dE&feature=related
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There are Free Lunches: Behavioral Clues to Live Happy in the Economic World is a blog that intends to present updated and relevant information about the "hidden" and only recently uncovered dimensions of the economic science: the behavioral factors. With this blog we intend to promote in Europe and in the rest of the World, the top research articles and perspectives on behavioral economics, decision making, consumer behavior, and general behavioral science. We aim to be followed by journalists, academics, managers, civil servants, and everyone who wishes to improve their daily interaction with the economic world and consequently, their lives' happiness.