The 'Pool's Closed' meme originated in 2006 on the social networking site Habbo Hotel, primarily orchestrated by users from 4chan’s /b/ board. Raid participants would create identical avatars featuring dark skin, afros, and black suits, then strategically block entrances to the virtual pool area, preventing other users from entering. They would spam the phrase 'Pool's closed due to AIDS' (and sometimes stingrays), often forming human blockades in the shape of symbols. This event is considered one of the earliest and most famous examples of large-scale internet raiding, symbolizing the chaotic and disruptive nature of early 2000s web culture. Today, it stands as a nostalgic relic of digital mischief and the power of anonymous collective action.