I really enjoy this book for it's ability to start group conversations around more than the latest movie you saw or plans for next week.
This book has tons of very different, thought provoking questions varying in depth, but really can stimulate good conversations, or simply getting to know people better. Generally testing the limits of morality, and personal views of what boudries can and can't be crossed, it makes for interesting discussion, and you will often find yourself getting way off track as your conversations take surprising turns from the original questions.
A terrific end table book, because it's impossible for guests not to pick it up and start asking away.