HUD Windscreen with Virtual Destruction

Design a Heads Up Display unit in your car which creates an overlay onto the real world allowing you to fire off virtual rockets, missiles and what have you at the surrounding traffic and landscape. Similar stress relief exists for your computer monitor [link] but in the car is where you'll really find a target rich environment.

The software would track your eye position and upon hearing you utter "Fire Sidewinder" a virtual missile would streak off the front of your car and obliterate that inconsiderate taxicab into a roiling ball of fire. Of course, the taxi would still be there after the dramatic fireworks show but you'd feel so much better. And you can always fire off another salvo when the stress levels rebuild.

You could even launch a "Big Boy 3000" over the horizon in the general direction of your workplace or arch-enemy's home to be rewarded with a mushroom cloud. Connect it to a good set of bass speakers in the trunk and you would viscerally feel the world tremble at your wrath.