The Pratfall effect is the finding that a competent person or brand becomes more likable after a small, visible mistake, because the flaw makes them feel human rather than staged. In advertising, it's the psychology behind running a genuine negative review as proof instead of hiding it.
First documented by Elliot Aronson, Ben Willerman, and Joanne Floyd at the University of Minnesota in 1966, the Pratfall effect showed that a knowledgeable person who commits a small blunder is rated more attractive than one who performs flawlessly. A mediocre performer who blunders gets the opposite result: their likability drops.
The distinction matters for advertising. Competence plus a visible flaw reads as human and trustworthy. Mediocrity plus a flaw just confirms the weakness. That is why the effect only works in ad creative when the flaw sits on top of a genuine strength, such as a customer complaining a product is "too strong" or "too effective."
The Pratfall effect explains why a self-aware negative review can outperform a curated five-star testimonial in front of cold traffic. Polished claims read as advertising and get filtered by default skepticism. A brand publicly owning a real, minor flaw reads as unmanaged and therefore credible, which is the exact trust gap paid creative has to close.
