That is the Haka of the All Blacks, New Zealand's national rugby team. I don't know how the Australians fared on that particular day, but if I played on an opposing team, and I saw those guys doing that dance, I would run like hell in the opposite direction while screaming about my plans for immediate retirement.
We still have much to learn in America about intimidation.
Haka of the All Blacks [Wikipedia]
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