Book excerpt: How to Ruin Your Life is a powerful self-help tool in the form of a work of humor. It is sardonic advice, presented with tongue in cheek, explaining how people can ''ruin' their lives. The essays cover topics such as ''Convince Yourself That Youre All That Matters,' Think the Worst of Everyone,' ''Pour Salt on Those Wounds,' and ''You Can Change People.' Seriously, though, to anyone who reads this book, it is an earnest warning about falling into traps of self-destructive behavior that can ruin any man or womans life. More than that, it comprises 35 steps that - if read and understood - provide a road map to making life work in the most effective way possible. It is humor and self-help all in one, delivered by Ben Stein, a man who has witnessed more than his share of people who did ruin their lives - as well as those whose lives have been wildly successful.