Half-Life 2 is Valve's 2004 first-person shooter sequel to Half-Life, known for its detailed world, physics puzzles, and atmospheric sound design. Its cough sounds come from the game's ambient character audio rather than a famous spoken catchphrase, which is why the clip works so well out of context. Shared widely on soundboards, it became a handy shorthand for illness and virus jokes, especially in gaming edits and reaction videos where a quick, recognisable cough says more than a caption.