The exact origin of this particular kapow clip is not documented, which is common for tiny reaction sounds that travel between user soundboards and short-form edits. Kapow-style pops like this one are staples of reaction libraries because they do the work of a full punch effect in a fraction of a second, landing on cuts, reveals and comedic hits without slowing the pace. On soundboard pages it sits alongside other quick reaction hits, and in edits it usually appears at the exact frame a surprise lands.