"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):
G. Edward Griffin
The quintessential treatise on economics. Cussed and discussed by all from notable politicians to academicians to laypersons. Do you want to know the truth about money? Creature from Jekyll Island will give you the answers to these, and other, questions: Where does money come from? Where does it go? Who makes it? The money magicians' secrets are unveiled. We get a close look at their mirrors and smoke machines, their pulleys, cogs, and wheels that create the grand illusion called money. A dry and boring subject? Just wait! You'll be hooked in five minutes. Creature from Jekyll Island Reads like a detective story which it really is. But it's all true. This book is about the most blatant scam of all history. It's all here: the cause of wars, boom-bust cycles, inflation, depression, prosperity. Creature from Jekyll Island is a "must read." Your world view will definitely change. You'll never trust a politician again or a banker.