No matter how many times you watch it, the Haka never ceases to make the hairs on the back of your neck stand up. It can give the All Blacks a psychological advantage and there has been plenty of debate over how the opposition should react to the war cry.
However, the New Zealand rugby team didn't always take the Haka so seriously. No doubt the current Irish squad would rather be facing down this 1973 version than what they'll be greeted with on Sunday:
I wonder how the Michael Flatley directed Irish dance response is coming along.