Source: http://www.wendys.com/the_ads/ads_frame.html

"Hamburger A, Hamburger B In June 1987, the company introduced the successful "Hamburger A, Hamburger B" campaign where an interviewer asked people to choose between Hamburger A, a fresh Wendy's hamburger, or Hamburger B, an unappealing hamburger made from frozen beef. In April, 1989, Dave Thomas returned to the commercials with news about Wendy's latest taste test victory in the hamburger wars. The commercials featured Thomas offering a money back guarantee if consumers didn't agree that Wendy's has the best-tasting hamburgers in the business. This commercial was supported by one of the largest testimonial advertising campaigns in television history. The ads made television stars out of nearly 400 consumers nationwide."