"What is the book that changed your life? (not novels or religious texts)"
I think it's a wonderful way to connect in a less superficial way and learn a little more about each other. It's also a wonderful way to discover new books worth reading.
This is one of them (the full list is here):
Wake up and take control of your life! From the bestselling author of Inner Strength, Unlimited Power, and MONEY Master the Game, Anthony Robbins, the nation's leader in the science of peak performance, shows you his most effective strategies and techniques for mastering your emotions, your body, your relationships, your finances, and your life. The acknowledged expert in the psychology of change, Anthony Robbins provides a step-by-step program teaching the fundamental lessons of self-mastery that will enable you to discover your true purpose, take control of your life, and harness the forces that shape your destiny.