Which celebrity's product endorsement resulted in the company's stock dropping by nearly 15% in a single day after their controversial social media post about the product went viral for all the wrong reasons?

Celebrity endorsements can make or break a product launch. While many partnerships become iconic marketing successes, others have turned into PR nightmares and retail disasters. This trivia tests your knowledge about famous people whose product endorsements backfired spectacularly, causing significant sales drops, brand damage, or contract terminations. Can you identify which celebrity-product pairing led to one of retail's most notorious endorsement failures?

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Kendall Jenner's Pepsi 'protest' commercial (2017)
Taylor Swift's partnership with Keds footwear (2015)
Leonardo DiCaprio's Tag Heuer watch campaign (2009)
Serena Williams' Nike 'Greatness' collection (2019)