Can a fly painted on your toilet save you money on cleaning? Why is it the vegetable section that greets the buyer in the supermarket? And how does simple dryer lint help pick-up artists meet women? In our lives, we constantly underestimate the influence of seemingly insignificant things on behavior, thinking, and perception of reality. Your brain deceives you every day, and well-known experts in this field, Eva van den Broek and Tim den Heijer, will tell you exactly how. The guide on this entertaining journey will be the most ordinary... buzzing fly! The buzzing fly effect refers to various cognitive distortions and errors in thinking that make us afraid to leave our comfort zone, make the same mistakes when stressed, and so eager to fit into social norms. A buzzing fly will catch you anywhere, from a Michelin-starred restaurant to a notary's office. Just like from a real fly, there is nowhere to hide from it. Moreover, its effects are often used by marketers, politicians, economists and many others, even without you noticing it. Using specific real-life examples and statistical data, the authors will tell you how to recognize the effects of a buzzing fly in everyday life, avoid their negative consequences, and cope with temptations and prejudices. This book will give you a fly swatter and teach you not only to make the right decisions and sensibly assess the environment, but even to use thinking errors for good.