Which of these popular products was originally developed as a failed attempt at creating something entirely different?

Throughout history, many groundbreaking products were actually the result of failed experiments or accidents. From penicillin to Post-it notes, mistakes have led to some of our most treasured inventions. This trivia challenges you to identify one such famous 'failure-turned-success' story in product development. Can you distinguish between genuine product development accidents and fictional stories?

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Play-Doh was originally manufactured as a wallpaper cleaner before becoming a children's modeling compound
Coca-Cola was originally intended as a new type of dish soap before someone accidentally added carbonated water
Velcro was deliberately engineered as a space-age fastening technology for NASA's Apollo missions
Post-it Notes were developed specifically for bookmarks after extensive market research identified the need