The exclamation sound was part of the default sound scheme in Windows XP, released by Microsoft in 2001 and used on hundreds of millions of computers. It played when the system needed attention for a warning or blocked action, which is why it became the universal error sound for a generation of PC users. As nostalgia for XP grew online, creators lifted the chime for memes and edits alongside other notification tones like a ding sound effect, keeping it alive long after the operating system was retired.