Standing in front of a camera in his kitchen, 22-year-old Oakley opens a bottle of sambuca, fills a pint glass almost to the top and pours in a dash of WKD Irn Bru. In less than nine seconds he has swallowed the lot. Choking slightly, he points at the lens and reels off three friends' names to take up the challenge, saying: "You've got 24 hours, lads. Get it done."
Oakley is one of thousands of Britons who have taken part in neknomination, an online drinking craze that has escalated to lethal levels as its young participants try ever more hazardous stunts.
Just hours before Oakley uploaded his video last Sunday evening, the body of Jonny Byrne, 19, was discovered in the river at Milford Bridge in Co Carlow after he jumped in as part of a "nomination". Ross Cummins, 22, died in hospital after being found unconscious at home in Dublin. He is understood to have been drinking spirits at the time and had previously taken part in the game. (Neither death had any connection to Oakley.)
The craze is believed to have started between college friends in Western Australia, before spreading across the world. What began as drinking just a pint of beer or a shot for the camera and nominating a friend to do the same has escalated into more and more outlandish videos.
Oakley, who does not want his surname published, thinks the game is still fine if people know their limits – though these limits do not apparently preclude drinking a pint of 42 per cent spirits. "Some people take this stuff too far," he said. "I did drink quite a lot of sambuca, which is a strong alcohol, but I did it in the safety of my own home. It was an awful lot, though. I poured way more than I meant to but I'd broken the seal of the bottle, so I couldn't start again."
Oakley, who has his own YouTube channel called Oakelfish, has had his drinking binge viewed by more than 27,000 people. "There are people like myself who are doing it for a laugh, but there are also people doing it with something to prove.
"Now it looks really stupid and not fun at all because people have died from it."
For Eric Appleby, chief executive of Alcohol Concern, some are already taking things too far. He said: "This lethal 'game' shows just how hard we have to work to de-normalise binge drinking among young people. But it's not just about young people: they take their cues from society's attitude to drinking, and it's this we have to change for all our sakes."
Others have found different ways to shock. Johnnie, a 26-year-old tutor, filmed his friend dressed as a sheikh drink down a pint of beer in a Muslim area of Coventry and strip off in the road. "We've taken it down now," he says sheepishly of the YouTube clip. "Looking back, it probably wasn't the most intelligent thing to do."
Since the deaths, many people have pledged to remove their videos from the internet. One neknominate Facebook group has even been changed to an alcohol-awareness page. But Johnnie thinks such measures are too heavy-handed: "I think these pledges to get videos taken down are silly. If you're going to jump into a canal or a lake after a drink, there's a chance you might die.
"If you down a litre of spirits, there's a chance you might die, but if you're just having fun with it I don't see the problem."
A more imaginative backlash against the drinking culture encouraged by the game was started by South African Brent Lindeque. Having received a neknomination, he posted a video of himself handing out a packed lunch to a homeless man from his car, and it went viral.
Allan Price, a friend of Mr Lindeque's who now lives in London, decided to bring the idea to Britain. Mr Price, 34, filmed himself distributing 10 £10 notes across the capital. Each was in a plastic bag with a piece of paper instructing its finder to spend it on a good deed.
Mr Price said: "I was nominated by my cousin who was already drunk when he did four shots and a tumbler of spirits for his neknomination. I wanted to do something cooler.
"It's not as if I can afford £100, but doing something that helped people felt really awesome."
The most controversial internet crazes
The most controversial internet crazes
1/7 Gun Selfies
Where it actually came from remains a mystery, but the 'Selfie' remains a popular feature on the internet - it was even named word of the year by Oxford Dictionaries in 2013. However, a number of gangs in America have taken it a step further, posting 'gun selfies' of themselves. Last year, two men were charged for 142 counts of possession of a firearm and were bailed by police after posting numerous photos. The craze has led to several calls for photos to be taken down, with parents fearing that children could try and create their own poses.
Originating in Australia in 2008, the trend of 'planking' swept Britain a year later. The craze, in which people form a straight figure with hands down by their sides, had thousands of participants uploading their efforts on to Facebook. While most were harmless enough, the more daring have been known to plank across railway tracks and between buildings, causing major health concerns. In 2011, a 20-year-old man died after 'planking' on a seven-story building in Australia.
Twerking, a mixture of twisting and jerking, has been around since the late 1990s, but its popularity dramatically increased after Miley Cyrus 'twerked' at the 2013 MTV VMA awards with Robin Thicke, prompting fans to upload their own versions on Youtube - we've even had twerking stormtroopers. It's since been accused of corrupting the minds of young people and, last year, 33 students were suspended after making a video of themselves 'twerking' using school equipment.
4/7 Happy Slap
It's been almost a decade since the Happy Slap craze broke out in the UK, but what started out in as a small joke between friends in Lewisham in 2004 eventually became a nationwide phenomenon. Happy Slapping involved a victim being filmed on a camera phone getting slapped. As the craze spread, incidents became more and more vicious and it was linked to a rise in bullying in school playgrounds. In 2008, a teenage girl was sentenced to two years' detention after filming the fatal beating of a man.
'Tombstoning' emerged in 2012 as a much more dangerous fad. It involved finding the highest rock to leap from, giving jumpers sufficient time to change their body position to resemble a tomb falling into the sea. It was invented initially as a way to keep cool during sizzling temperatures, but as the challenges became more daunting, some experienced horrific injuries as a result of jumping into shallow or rocky waters.
While not as dangerous as other internet fascinations, McDonald's staff are now finding themselves on the receiving end of another internet craze. 'McDiving' started last year and normally comes at the end of an alcohol-fuelled night out, where it is then customary for a 'McDiver' to go to the nearest McDonald's and launch themselves over the counter. McDonald's franchises have even started hiring bouncers at peak times of the day to deal with any mischief makers.
7/7 Gallon Smashing
Given that glossy floors are prominent in supermarkets, it would be deemed acceptable to see the occasional person slip over. But this is no accident. Gallon smashing started to appear on Youtube last year and has becoming increasingly popular in the US. It sees agile teenagers throw gallons of milk in the air as well as hurtling themselves on to the ground. However, with the mess, cost and inconvenience that is caused, the 'gallon smashing' craze has seen security stepped up in supermarkets.