The Combine are the alien-backed authoritarian force occupying Earth in Half-Life 2, released by Valve in 2004, and their soldiers speak through heavily processed voice filters that give even a simple laugh a mechanical, threatening tone. Clips ripped from the game spread through Garry's Mod videos, Half-Life edits and general meme soundboards, where the laugh became shorthand for cold, superior amusement. It is still used because it is short, instantly recognisable and carries a very specific menace that a normal laugh cannot, making it useful whenever a creator wants a villain to enjoy someone else's failure.