Frankie Goes to Hollywood was a British band best known for their one hit, "Relax." In 1984 the release of their Two Tribes album coincided with a T-shirt campaign that became popular, of the two shirts, the one more remembered today is the one that says "Frankie Say Relax" on the front and "Don't Do It" on the back. They were also immortalized in Zoolander.
45. Frankie Says Relax T-shirts