This clip comes from the Windows system sound set associated with Longhorn, the development codename for Windows Vista, and it plays when hardware is safely removed or a USB device is disconnected. Similar device-removed tones have been part of Windows for years, but this short descending version became familiar to PC users in the Vista era. It later spread through soundboards and short-form video, where creators reuse it as shorthand for something being unplugged, ending or disappearing.