Skype launched in 2003 and became the default video calling app for much of the 2000s and 2010s, so its interface sounds were heard by millions every day. The hangup tone played whenever a call ended, whether normally or after a dropped connection, and quickly became shorthand for leaving a conversation online. As clips and edits moved to YouTube and Discord, creators kept using the sound even outside Skype itself. It survives as a nostalgic cue for an abrupt digital exit, instantly understood by anyone who used the app.