The C4 bomb sound comes from Counter-Strike: Global Offensive, Valve's long-running competitive shooter released in 2012. Players hear it during bomb scenarios, where the beeping becomes an instant cue for urgency and limited time. Because CS:GO remained one of the most watched and played PC games for years, the sound spread into montages, streamer edits, and meme videos far beyond the game itself. It still works online because even short snippets immediately suggest a planted bomb, similar to the phrase bomb has been planted.