Every single hair on my body is standing on end after this. I need to go find someone to fight or something.
If you don't have 18 minutes to spare then I implore you to watch the awesome opening and then you can skip to 13 minutes for Ireland v New Zealand and Wales v Australia.
http://www.youtube.com/watch?feature=player_detailpage&v=2qgBiOzcowU
hat-tip: Reddit Rugby Union