Which iconic brand slogan was originally created as a temporary campaign but became so popular that the company kept it permanently?

Brand slogans can become cultural touchstones that transcend their products and embed themselves in pop culture. Behind many of these catchy phrases are fascinating stories of creative inspiration, marketing strategy, or even happy accidents. Test your knowledge on the origins of some of the most recognizable brand taglines that have shaped consumer culture and become part of our everyday language.

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Nike's 'Just Do It' (inspired by the last words of executed murderer Gary Gilmore)
McDonald's 'I'm Lovin' It' (launched with a Justin Timberlake jingle)
M&M's 'Melts in Your Mouth, Not in Your Hands' (created during WWII for soldiers)
De Beers' 'A Diamond is Forever' (written hastily by a copywriter in 1947)