MSN Messenger was Microsoft's instant messaging service, launched in 1999 and widely used through the 2000s before it was retired in favor of Skype. Its alerts, nudges and sign-in sounds became part of everyday online life for millions of users. This attention tone survived in meme edits and nostalgia videos because it is so brief and recognizable, functioning today much like a ding sound effect for a new message. It is often paired with fake chat screenshots, reaction cuts and reminders, where one hit instantly signals that someone needs a reply right now.