The Y2K Bug, also known as the Millennium Bug, refers to a potential computer glitch related to the storage of calendar dates in the transition from 1999 to 2000. While it caused worldwide panic and predictions of societal collapse in the late 1990s, the event ultimately passed with very few major incidents thanks to years of preparatory work by programmers. In the meme world, the Y2K Bug is frequently used to represent overhyped events that turn out to be underwhelming, or to tap into the 'Y2K aesthetic' characterized by futuristic 90s design. It serves as a classic template for comparing dramatic expectations against a surprisingly mundane reality.