This chime comes from Microsoft Windows, the operating system used on most desktop PCs, and it is the sound Windows 10 plays when it recognises a newly connected USB device. Because almost everyone who has used a Windows computer has heard it in everyday use, the short tone became easy shorthand online for connection, setup and troubleshooting. Tech creators reuse it in tutorials and unboxings, while meme editors borrow the same familiar cue to joke that something, or someone, has finally clicked into place.