Grand Theft Auto: The Ballad of Gay Tony was released in 2009 as the second story expansion for Grand Theft Auto IV, returning players to Liberty City for a nightclub-focused story. The 'I keep on walking' line comes from that game, and like many short GTA voice clips it has since been lifted onto soundboards for reuse outside the original missions. It survives mainly because the attitude is easy to reuse: editors can drop a familiar Liberty City voice into almost any walk-away moment without needing the surrounding scene to explain the joke.