The Haka is a war dance performed by the All Blacks, also known as the New Zealand rugby team. You can hear the haka being shouted in my music. Only the rugby teams from the South Sea Islands have a haka, and all the islands have different versions.
There is a haka that has been banned because they pretend to cut their throats with knives. They don't do it any more because some people in rugby thought it was too violent.
I've never seen a haka done live. I almost saw it live at the Under 19 Rugby World Cup in Dubai, when Ireland were playing Western Samoa, but we arrived at the match late because of traffic and missed it :-(
It doesn't matter if New Zealand are playing home or away, the reaction to the haka is incredible.