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

Brand slogans become part of our cultural vocabulary, but their origins often contain fascinating stories of creative inspiration, strategic pivots, or happy accidents. Test your knowledge of how some of pop culture's most recognizable brand catchphrases came to be. Beyond just recognizing the slogan, do you know the backstory of how these iconic phrases entered our collective consciousness?

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Nike's "Just Do It" - inspired by the last words of convicted murderer Gary Gilmore before his execution
M&M's "Melts in your mouth, not in your hands" - created after soldiers in WWII reported chocolate bars melting in hot climates
McDonald's "I'm Lovin' It" - originally just a Justin Timberlake song hook before becoming the permanent slogan
Apple's "Think Different" - Steve Jobs personally wrote it during a late-night brainstorming session