Call of Duty Zombies began as a bonus mode in Call of Duty: World at War in 2008 and grew into a standalone staple of the series across Black Ops titles. Its short UI cues, stingers, and character callouts became widely clipped for soundboards because players instantly recognise them outside the game. This type of brief effect spread through YouTube montages, streams, and meme edits, where a familiar game sound can signal danger, a kill, or a turning point without any explanation, which is why these cues remain popular years later.