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Claus Wahlers, a resident of São Paulo's Moema neighborhood, recorded a video of his neighborhood during Brazil's opening World Cup match against Croatia. Although there's little action to see, the eruption of noise each time Brazil scores is amazing. It sounds like the audio's coming from within the stadium, but it's just normal Brazilians in bars and restaurants celebrating like they normally do - with vuvuzelas, screams, and fireworks.
Here's the video: