Andi Doherty downs a litre of neat vodka in what he has dubbed the ‘Iron Liver Challenge’. See SWNS story SWVODKA: A dangerous new online craze is seeing Brits put their lives at risk by downing entire bottles of spirits – including a bloke who necked a litre of vodka in under a minute. Andi Doherty (corr), better known as Skat Dagger, is part of a group filmed the latest ‘Iron Liver Challenge’ – downing a potentially deadly 40 units of Smirnoff in less than 60 seconds. The 29-year-old father, who is covered from head to toe in tattoos and piercings, put his stunt on YouTube and has had over 2,000 hits. Body piercer Andi, from Folkestone, Kent, calls his trials the Iron Liver Challenge and is now inviting the public to suggest other spirits for him to drink.