World Champions New Zealand wowed the Wembley crowd with a spine tingling rendition of the Haka before they kicked off their World Cup campaign against Argentina in Pool C.
Before the All Blacks began their title defence they infused themselves with aggression and their opposition with trepidation when captain Richie McCaw led them in the Maori war dance.
The side adopted the pre-match ritual more than 120 years ago and currently use the Kapa o Pango, which was composed for them in 2005.
Thousands of first-time fans and seasoned supporters took to social media to react to the terrifying tradition.
Here's some of the best from Twitter...
Richie McCaw standing at the front of the Haka. Chills. #AllBlacks— Piers Morgan (@piersmorgan) September 20, 2015
How good is the Haka... Some great facials going on... Loving the rugby World Cup... #RWC2015— Jack collison (@Jcollison31) September 20, 2015
That #Haka was much better than Dawsons version!! Loved it— Austin Healey (@IamAustinHealey) September 20, 2015
— SuperSport (@SuperSportTV) September 20, 2015
Some real intensity in that Haka. New Zealand looking up for this.— In The Loose (@InTheLoose) September 20, 2015
I don't care who you are, if that doesn't raise the hair on the back of your neck, you ain't human. #haka— Andries Pretorius (@AndriesPret) September 20, 2015