Which celebrity endorsement deal resulted in the largest single-day stock price increase for a company when announced?

Celebrity endorsements have become a cornerstone of modern marketing strategy, with brands paying millions to associate their products with famous faces. But how well do you understand the actual business impact of these high-profile partnerships? This trivia question explores a fascinating aspect of celebrity influence on product performance that might surprise even marketing professionals.

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George Clooney's partnership with Nespresso
Michael Jordan's lifetime deal with Nike
Kylie Jenner becoming the face of Puma
Oprah Winfrey's investment and endorsement of Weight Watchers