Because everyone should know what the Haka is:

From
Haka – Wikipedia, the free encyclopedia

The haka is often described as a “war dance”, but it is more correctly a chant with hand gestures and foot stamping, originally performed by warriors before a battle, proclaiming their strength and prowess in order to intimidate the opposition. The haka may be understood as a kind of symphony in which the different parts of the body represent the many instruments. The hands, arm, legs, feet, voice, eyes, tongue and the body as a whole combine to express courage, annoyance, joy, or whatever feelings are relevant to the occasion.