"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):
Thomas J. Stanley
The incredible national bestseller that is changing people's lives -- and increasing their net worth! CAN YOU SPOT THE MILLIONAIRE NEXT DOOR? Who are the rich in this country? What do they do? Where do they shop? What do they drive? How do they invest? Where did their ancestors come from? How did they get rich? Can I ever become one of them? Get the answers in The Millionaire Next Door, the never-before-told story about wealth in America. You'll be surprised at what you find out...