Which accidental discovery's brand story was intentionally reframed from its medical origins to become a household product, with marketing that completely reimagined its purpose?

Some of the world's most iconic products began as accidents or experiments gone wrong. Behind these unexpected inventions lie fascinating brand stories that shaped how companies marketed their discoveries. This trivia tests your knowledge about the surprising origins of famous products and how their creators transformed mishaps into compelling brand narratives that resonated with consumers. Can you identify the true story behind this accidental innovation?

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Play-Doh (originally created as a wallpaper cleaner before being rebranded as a children's modeling compound)
Coca-Cola (originally marketed honestly as a medicinal nerve tonic containing cocaine before pivoting to a refreshment beverage)
Post-it Notes (3M initially told the true story of its inventor's failed adhesive experiment that led to repositionable notes)
WD-40 (always marketed truthfully as the 40th attempt at creating a water displacement formula for the aerospace industry)