The sound is a recorder cover of John Cena's long-running WWE entrance theme, The Time Is Now, a track built around a bold brass-style hook and a confident rap intro that wrestling fans recognise instantly. On Vine, short recorder renditions became a running joke because the cheap, squeaky instrument stripped away all of the original's swagger. Clips like this one spread as reaction audio for ironic entrances and surprise reveals, and the format stuck because anyone can recognise the tune within a second, even when it is played badly on purpose.