Streets of Sim City
Developed/Published by Maxis
This is one of those games that absolutely blew my mind when I was a kid. See, this was when Maxis was in its prime. They had their "touch" to how games should be made. Not only is driving cars with rocket launchers completely awesome, but also the fact that you can make maps in Sim city 2000, and drive in them with SOSC adds to the coolness of this game.
If you have never played, or even heard of this game, I highly suggest you download it. (Also play SimCopter if you haven't before.)