Left 4 Dead is a cooperative first-person shooter released by Valve in 2008, in which teams of survivors fight through waves of infected while trying to reach safe rooms. Its audio became part of gaming culture as players shared short clips from matches on soundboards, forums and video edits, using them as shorthand for zombie danger and frantic survival moments. Because the game remains popular with streamers and modders years later, these brief sounds still work instantly for audiences who recognise the series, even in videos that are not about the game itself.