when things started going a bit crazy he and his mother were left in a mining town. Not only all the characters but every object how it all found its way into this world and how it survived." Miller told Deadline. "The approach to the film was you have to be able to explain everything. George Miller laid out a widely intricate backstory for the Coma-Doof Warrior. Writer/director George Miller said that he got the idea for this from Australian filmmaker David Bradbury's 1981 Vietnam War documentary "Front Line", in which Cambodian soldiers preparing for battle suspend small jade figurines of Buddha from their mouths with little straps. Another clue to the spray's narcotic properties is the fact that "chrome" and "chroming" are Australian slang terms for inhalant abuse. However, in a May 2015 interview with CraveOnline, actor Hugh Keays-Byrne, who plays Immortan Joe, said that this practice, which the War Boys think is purely ritualistic, actually involves the inhalation of ".a very euphoric drug" that keeps the War Boys high and suicidally devoted to Immortan Joe. Both the War Boys and Immortan Joe often speak about this as though it is a religious ritual, saying that it will allow them to enter "the gates of Valhalla, shiny and chrome". To prepare themselves to go into battle, ready to sacrifice their lives for Immortan Joe, the War Boys spray their lips and teeth with a silver substance, very much like common spray paint.