The 'Downvote Bomb the Fourth Comment in The Chain' is a unique phenomenon rooted in Reddit culture, where users collectively decide to mass-downvote the fourth person in a repetitive comment thread. This 'rule' emerged as a form of social game or hive-mind behavior, particularly in subreddits like r/shitposting and r/memes around 2021. The meme captures the absurdity of internet groupthink, where a user is punished by the community for no reason other than their position in a sequence. It is frequently used to mock the unpredictable nature of karma and the arbitrary laws that govern online communities, serving as a warning to anyone brave enough to be the fourth person to reply.