The riff comes from Grabbag, the main theme composed by Lee Jackson for Duke Nukem 3D, released in 1996 by 3D Realms. The track became inseparable from the wisecracking action hero as the series moved from early 1990s platformers to a landmark first person shooter. Its heavy guitar hook was widely shared in early internet soundboards and game modding communities, then revived in retro gaming videos and meme edits. Today it remains a shorthand for 1990s shooter nostalgia and overconfident hero entrances.