The SMG fire sound comes from Half-Life 2, the landmark 2004 shooter developed by Valve, where the submachine gun is one of Gordon Freeman's staple weapons. Its distinctive rapid burst became familiar to millions of players and later spread through Garry's Mod machinima, YouTube gaming edits and meme compilations that reused Valve's audio library. Like the pump shotgun blast from Fortnite, it is one of those game gunshots people recognise instantly, and it still shows up in short-form edits whenever a creator needs a quick burst of automatic fire without recording anything themselves.