One of the most complained about and denigrating social issue that impacts human relationships and friendships is the Know-It-All behavior in all its manifestations and ramifications. Furthermore, most people know and remember vividly the feeling of discomfort and tense trepidation that lasts the duration of an encounter with a Know-It-All. The tens of thousands of Know-It-All related complaints from people of all walks of life, gender and culture helps us to comprehend the magnitude of this exasperating and aggravating social problem. This book is uniquely a first on many fronts, for example, chapter 1 of this book draws the reader into the book by numerically and textually illustrating the enormousness, ubiquity and global nature of the Know-It-All behavior. But the book does more than that, it defines the term Know-It-All, identifies who is a Know-It-All, enumerates in an anecdotic manner the different ways people manifest the Know-It-All behavior, recounts how the Know-It-All behavior makes us feel, details psychologist's recommendations for curtailing and stopping the Know-It-All behavior, and finally empowers victims with 20 practical ways to peacefully and respectfully shut up a Know-It-All. This well researched book, with almost 300 references, numerically and textually answers questions such as: Are men more likely than women to be Know-It-Alls? What is the most complained about manifestation of all the Know-It-All behaviors? Are people more annoyed with Know-It-Alls who constantly interrupt others to opine their ?wisdom? or are people more upset with Know-It-Alls who are incessantly correcting other people like a machine gun stuck in a permanent firing mode? How do people generally feel in the presence of a Know-It-All? Do they feel that the Know-It-All is trying to control them or intimidate them? Of all the people we associate with on a daily basis who is most likely to be an agonizing Know-It-All? Who is more likely to be a Know-It-All between your best friend and your father?