Whilst I was in Sao Paulo there was a street riot.
Some of the market trader types which over-run the center of Sao Paulo town were set apon by the police which turning into a running street battle, traders v police.
The evening news
When I returned to my hotel that night there were pictures of the traders burning what was left of their illicit goods.
One of the images that will stick in my mind is a burning Spongbob Squarepants effigy being held aloft and marched through the streets of Sao Paulo by angry market traders.
Central Sao Paulo
Most of the center of Sao Paulo is given over to the poor, downmarket traders and streetpeople in general.
Santiago Chile was dangerous at night, central Sao Paulo is pretty much a no-go area at any time of the day or night.