Aside from the impressively calm demeanor of the gentleman holding the video camera, this disturbing clip of the Washington Tornado's power offers a helpful (if not terrifying) analogy for how quickly calm serene surroundings (e.g. stock markets) can be "freaking destroyed" almost instantly by an external force.
And for the Keynesians, before you start babbling about the GDP growth in the rebuild - please visit the Broken Window Fallacy truth page [2].