The cannon comes from The Hunger Games, the film series adapted from Suzanne Collins' novels beginning in 2012. Inside the arena, a cannon fires for each tribute who dies, and the shots are later counted during the nightly recap of the fallen. That clear in-story rule made the boom easy for fans to lift out of context. Editors and meme creators adopted it as a universal elimination cue for games, reality show parodies and fan videos, where a single blast tells viewers someone is officially out without needing any on-screen caption or dialogue.