The buzz comes from MSN Messenger, Microsoft's hugely popular chat program of the 2000s, where the nudge feature let one user shake another person's chat window and play this rattling sound to demand attention. As MSN faded and was replaced by newer apps, the sound survived in nostalgia compilations, reaction videos and meme edits that recreate the feeling of being poked online. It endures because it is instantly recognisable to anyone who grew up chatting after school, and it still works as a quick, funny interruption.