Metal Gear Solid 2, released in 2001, made enemy guards famously vocal, with a short questioning sound marking the moment they notice a disturbance before fully raising an alarm. That brief alert cue became shorthand among players for suspicion, and it travelled beyond the game through gameplay videos, reaction edits and soundboards where a single confused grunt could sell a joke. Because the sound is instantly recognisable from stealth gameplay and needs no context, creators still use it to signal that something does not add up.