If you live in a city, you're familiar with the verbal ramblings of schizophrenics. You may have heard their speeches directed to no one while they're walking down the street toward you or waiting for the train. I used to occasionally share my afternoon commute with a man who liked to stand near the back of the bus and deliver a continuous and incoherent Shakespearean-style monologue, complete with accent and extravagant hand gestures.