Can a fly painted on the toilet save you money on cleaning? Why is the buyer in the supermarket met by the vegetable department? And how does a simple drier pile help pickup trucks meet women? In our lives, we constantly underestimate the influence of seemingly insignificant things on behavior, thinking, and perception of reality. Your brain tricks you daily, and well-known experts in the field, Eva van den Broek and Tim den Heyer, will tell you exactly how. The conductor in this entertaining journey will be the most ordinary... buzzing fly! The authors call the effect of a buzzing fly various cognitive distortions and errors in thinking, because of which we are afraid to leave our comfort zone, make the same mistakes under stress and are so eager to fit into social norms. A buzzing fly will overtake you anywhere, from a Michelin restaurant to a notary office. Like the real fly, there is no hiding from it anywhere. Moreover, its effects are often used by marketers, politicians, economists and many others, even if you do not notice it. Using concrete examples from life and statistics, 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 hand 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 the good.