The clip circulates under the KF Sousa name, with tags tying it to TikTok, Free Fire and funny Portuguese-language meme edits, although a single original recording or scene is not clearly documented. Its spread comes from its simplicity: two taps are easy to recognise, easy to caption and easy to drop into almost any short video. Players reuse it for headshot callouts, cheat jokes and mock arrivals, while general meme editors use the same knock as a tiny interruption before a reveal, reaction or abrupt cut.