The tactical nuke comes from Call of Duty, most famously Modern Warfare 2 from 2009, where it was a game-ending killstreak reward earned after 25 kills without dying. Its warning siren and announcement became instantly recognisable to shooter players, and clips of the countdown spread through early gaming videos and forums. Editors later lifted the audio away from gameplay and began using it as a standalone punchline for any oversized reaction. It remains popular because the meaning is clear in seconds, even for viewers who never played the game.