Here is the
backstory on that car-stacking video.
It's quite a long, serious read, but well worth your time.
"
The creek then slices though the corner of Queens Park, slides beneath the main city thoroughfare of Hume Street into Chalk Drive, the place where the smashed cars were filmed stacked end to end like a B-grade horror movie set. Here, the entire northern side of the floodplain has been turned into a bitumen car park, while the creek itself is transformed yet again into a narrow canal with trees planted in military formation on either side."