Yan Hou Zi 4 appears as a numbered entry in a user-shared series built around the Chinese name for smoke monkey, and no clear original video, creator, or release date is documented in the information provided. Its appeal comes from that simple, repeatable identity: a short, recognisable clip that can be dropped into many different jokes without explanation. Numbered versions like this often spread through soundboards and short-video edits, where listeners save the ones that fit their humour. That easy reuse has kept it circulating as a small reaction sound rather than a one-off viral moment.