Windows XP was Microsoft's widely used operating system in the early 2000s, and its shutdown sound played every time a user powered the computer down. As the system became a shared cultural memory, clips of its startup and shutdown sounds spread across video sites, forums and soundboards. Creators kept using the shutdown chime because it instantly signals finality without dialogue, and its soft, dated tone now carries a strong sense of early internet nostalgia. That instant recognition keeps it useful in memes, edits and reaction videos today.