The Power of Mismatch: How Incongruous Pairings Drive Ad Effectiveness
Ayden Kim — Westminster School, 995 Hopmeadow St, Simsbury, CT, 06070
Juhyun Kim — St. Johnsbury Academy Jeju, 10, Global edu-ro 304beon-gil, Daejeong-eup, Seogwipo-si, Jeju-do, 63644
Abstract
Traditionally, celebrity endorsements have relied upon the “Fit Hypothesis”, which assumes that there is a perfect match-up between a celebrity and a product. Ideally, this pair results in increased levels of trust and expertise, both in the celebrity and the product, thus increasing marketability and reliability. But recent “misfit” advertisements indicate a potential for an alternative path to successful advertising. In the following study, we will present findings from 32 participants who evaluated six real-world celebrity endorsement pairings using three fit metrics (expertise, image congruence, audience overlap) and three success metrics (brand recall, image improvement, interest change). Following this evaluation process, we asked participants to provide justifications to explain their ratings, which were thematically analyzed for results. It was expected that the celebrity endorsements with higher fit would receive better ratings, based on increased credibility, social proof, and the similarity between the celebrity and the product being advertised. While high-fit endorsements generally received the strongest ratings, not all low-fit endorsements performed poorly. One low-fit case, Shaq–Taco Bell, illustrates how emotional appeal and social proof may compensate for weak fit under certain conditions. Through a thematic analysis of 192 justifications, we identified five unique drivers that help explain both traditional and non-traditional success within the celebrity endorsement marketplace. Future utilizers of this market strategy may consider using this strategic incongruity in celebrity endorsements to call attention to products and create viral engagement, while establishing strong narratives that could sustain consumer interest.
Keywords
Keywords: Celebrity Endorsement; Fit Hypothesis; Strategic Incongruity; Value Congruence; Brand Recall; Purchase Intention; Social Proof
Introduction
In today's competitive marketing environment, agencies continue to use celebrity endorsements as a tried-and-true method for increasing the marketability of any one product. The Fit Hypothesis proposes that endorsements work best when there is a high degree of similarity between the celebrity and the product, though recent "misfit" advertisements suggest strategic incongruity may also produce positive results.
Conclusion
High-fit endorsements generally received the strongest ratings, but not all low-fit endorsements performed poorly. Cases such as Shaq–Taco Bell illustrate how emotional appeal and social proof may compensate for weak fit, suggesting that strategic incongruity can help marketers capture attention and sustain consumer interest.
How to Cite
Kim, Ayden; Kim, Juhyun. The Power of Mismatch: How Incongruous Pairings Drive Ad Effectiveness. Journal of Youth Impact. June 2026; 1(Issue 2). DOI: https://doi.org/10.66245/jyi.v1.i2.015