The C4 bomb sound comes from the Counter-Strike series, where planting and defusing the bomb is one of the game's signature objectives. Because that mode is central to Counter-Strike, the countdown beeps became recognizable far beyond regular players. The sound spread through game edits, troll videos, and soundboard clips, especially in CSGO-era meme culture. People still use it because the audio communicates danger and urgency almost instantly, making even simple footage feel like a last-second clutch or a prank setup.