Below are some examples of advertisements with celebrities, which imply celebrity endorsement of a product or service, while celebrities often do endorsements on the basis of the amount of money they are paid to do so. Advertisers like to use celebrities because they are generally likable and perceived as credible to the public. Because of the credibility assumed because an endorser is a celebrity, and the fact that many people will buy a product simply because they think one of their favorite celebrities likes it, this is a peripheral method of persuasion.
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Another commonly used credible endorser is an expert. These are occassionally used in advertisements where lots of information is given by someone who appears to be an expert, as below. These ads are a specific type of long arguments used for persuasion.
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More often, however, experts are used for their credibility in court as an "expert witness" whose expertise is assumed. Expert witnesses include psychologists who attest to a defendant's insanity, doctors who assert that a plaintiff has permanent injuries, and scientists who explain in ways that a jury can understand complicated issues such as DNA and other interpretations of evidence.