The How I Met Your Mother tie-in book The Bro Code covers 150 rules.
The book is presented as Barney Stinson’s authoritative guide to brotherhood, although it was written as a television tie-in by Carter Bays, Craig Thomas, and writer Matt Kuhn. Its rules parody exaggerated “bro” etiquette, covering loyalty, dating, drinking, sports, and the supposed obligations friends owe one another.
The number 150 refers to the book’s numbered articles or rules. The publisher describes them as approximately 150 unspoken rules, while the book itself presents the code as a formal collection of articles. That distinction can cause confusion when readers remember the approximate wording from promotional descriptions.
The Bro Code grew out of a recurring gag on How I Met Your Mother, where Barney cites its rules to justify his behaviour. The show also displayed random rules in vanity-card-style sequences at the end of episodes. It was published by Simon & Schuster and became one of the franchise’s best-known fictional books.