Insta-Kill has been a core power-up in Call of Duty Zombies since the mode's early maps, announced by the demonic announcer voice whenever a glowing skull drops from a defeated zombie. It remained a staple through Black Ops II, where a generation of players learned to rush the horde during its thirty second window. Clips of the line later spread to video edits and soundboards alongside other FPS callouts like Enemy Spotted, and Brazilian players know it as Morte Instantanea from the localised game audio.