The drowning countdown debuted in the original Sonic the Hedgehog, released for the Mega Drive in 1991, where it plays when the air timer starts running out underwater. It became one of the most recognisable tension cues in gaming, up there with the Metal Gear Solid alert sound, and later turned into a meme for any situation with a ticking clock. Creators still reach for it because the rising loop sells panic faster than almost any other retro game sound.