The Combine are the interdimensional empire that occupies Earth in Valve's Half-Life 2, released in 2004, and their soldiers speak through distorted radio vocoders that make even a laugh sound threatening. Clips of their voice lines were ripped from the game and shared on soundboards, where numbered variations like this one let editors pick a specific chuckle for a scene. It remains popular because the sound is instantly recognisable to players, needs no context to read as mockery, and fits short-form edits, reaction videos and gaming memes.