Perhaps this is too somber for this thread.
The center of São Paulo is not a nice place late at night. One area is known as Crackland, where crack addicts congregate. It is also right besides a concert hall. Often, leaving a concert, we would see masses of drug addled users, just shuffling about or lying around, on the sidewalk or even the pavement. Most were wearing rags, emaciated and ill. Their eyes are just blank and they seem to be just shells of people. They also don't care about the few cars driving through and you have to be very, very careful to avoid hitting anyone.
It is like something from a zombie movie and my heart breaks at the sight.