Which of these famous products began its life as something completely different from what it's known for today?

Throughout history, many famous product brands have undergone significant transformations in their logos, marketing approaches, and even product offerings. These evolutions reflect changing consumer tastes, technological advancements, and shifting cultural values. This trivia question challenges you to identify a fascinating example of how a major corporation's flagship product dramatically changed from its original purpose to what we know today.

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Coca-Cola, which was originally marketed as a medicinal tonic to cure headaches and morphine addiction
Post-it Notes, which were initially designed as bookmark placeholders for church hymn books
Listerine, which was first created as a floor cleaning solution before becoming a mouthwash
Play-Doh, which was originally formulated as wallpaper paste before being repurposed as a children's toy