The Elder Scrolls IV: Oblivion was released by Bethesda in 2006, and its city guards became widely quoted online for their repetitive, earnest dialogue while patrolling towns and investigating disturbances or an enemy spotted nearby. Short guard lines spread through gameplay videos, edits and soundboards because they were instantly recognisable to players who had heard them many times. This particular question works as a compact reaction sound, and it remains popular because it needs no context: a single suspicious voice is enough to suggest that something unexpected has just happened.