How do you like to spend your spare time?

Not only does this more informal question aim to get you to lower your guard and be yourself, but it also aims to determine how balanced your personal life is with your professional life. By learning more about your hobbies and other interests, they can get a better feel for how well you would get along with those on their teams and how well you might work with them. It also offers you an opportunity to make yourself a more memorable candidate and strike up an interesting conversation.