Wikipedia
Neknominate, also known as neck and nominate, neknomination or neck nomination, is an online drinking game. The original parameters of the game require the participant to film themselves drinking a pint of an alcoholic beverage, usually beer, in one gulp and upload the footage to the web. The participant then nominates two others to do the same, although a third nomination has also become commonplace. The nominated person has to complete the task within 24 hours.
The game became popular in early 2014, and as it spread it escalated, with nominees performing the challenge in more extreme circumstances, drinking more potent beverages or engaging in dangerous activities either during or immediately after consuming their beverage. The British tabloid newspaper Metro reported that at least five deaths in the United Kingdom and Ireland are believed to have been directly linked to the drinking game. One of these was Jonathan Byrne from County Carlow, whose father later appeared on The Late Late Show.