The name comes from a Chinese folk ritual in which a practitioner is said to enter a trance and travel to the underworld, often to seek a deceased relative or an answer from the spirit world. That unsettling association is why the phrase carries weight even for listeners who do not know the full tradition. As a short audio clip, it is used less as a lesson in folklore and more as an atmospheric cue, a brief spoken signal that something hidden, spiritual, or slightly forbidden is about to be shown.