““My best friend and I used to play a game sometimes...we'd divide everyone we knew into two categories based on the way they related to a single qualifying factor. It was a way to make sweeping generalizations that were wildly inaccurate, but invariably amusing to pronounce. For instance, people fall into two categories, those who listen to music to 'put' them in a certain mood, and those who listen to music because they're already 'in' a certain mood.””