This one's either someone you've gotta flat-out viciously run down in your car of thieved-choice in GTA V, or you riding a pocket-rocket equipped with a Uzi. My money's on the first, but hell, ride-bys were always a good laugh in GTA IV.
Oh, and there's a rumour we'll see GTA V on March 24th, which is a Sunday, so I call bullshit on that, until proven otherwise. Nintendo's the only one I know of which bizarrely likes to launch stuff on everyone's day off, and it's not even coming to the Wii. [CVG, Product-Reviews]