Left 4 Dead is a cooperative first-person shooter released by Valve in 2008, in which four survivors fight through levels filled with infected enemies. Its tense audio design helped make the game a favourite for horror and multiplayer content, and short clips from it have since been shared widely on soundboards and in gaming edits. Because the sound is so brief, it works as a quick audio cue rather than a full musical moment, and players still recognise it instantly years after release.