Head in a Jar began when Port Macquarie primary school friends Nick and Gordy, who hadn't seen each other for ten years and had devolved into metal guitarists now living in Sydney, came together playing Black Sabbath and Deep Purple covers in Nick's living room. These two met Finnish bass player Onni at the urinal during a screening of The Big 4 a few months later and after being impressed by the dexterity of his beard, they invited him to a jam. After answering an advertisement drummer Adam joined the band solidifying the lineup in early 2011. The Jar's first gig was in late April 2011 and since then they have been taking the Sydney thrash scene by storm.