That's why I love watching New Zealand play Rugby.
If you don't get why they do it, it's native warchants from wherever the team is from, in order to pump themselves up, and "scare" the other team. Not every team has one, or does it, just some. The main team is obviously New Zealand, with the haka. I personally love the ambiance it gives to things.
__________________ Fingerbang:
1.) The sexual act where a finger is inserted into the vagina or anus. Headbang:
1.) To vigorously nod your head up and down.