Well, useless if you don't own GTA IV and love destroying vehicles and property.
The point of this is to show you how to grab a car and get it ready for a graceful ballet on the streets of liberty city.
Credit goes to Wes9000 for showing us what fun could be had in our cars.
Step 1: Get your Skates!
Normal people would do this through a dealership or private seller, but Niko has other plans.
This process is both simple and extremely entertaining.
Notice we've used the Finesse style of carjacking (skate acquisition) here and simply asked for the vehicle.
Some other methods are messier.