Every Thursday, Brazilian psychiatrist Flavio Falcone trades his white lab coat for a red clown nose and heads to a decidedly unfunny place: a squalid Sao Paulo neighborhood known as "Crackland." Wearing a baggy red-and-black outfit with a floppy hat and make-up to match, the 43-year-old doctor dances a goofy routine through the sordid streets of the downtown neighborhood, which is known as Brazil's biggest open-air narcotics market. Falcone's goal is to build a relationship of trust with those struggling with addiction, many of whom fear being forced into treatment facilities by the authorities. IMAGES AND SOUNDBITES