To the hard part... how to steal it. Spray out a fire extinguisher and wash it very good. Remove the top to do this. If your lucky it will still have a seal of pressure. Run up to the tank a non-conspicuous one is the best and look for the to valves. Make sure the hose is far away from you and turn one very slowly. If you hear a gush of air these is the pressure valve if not it is the liquid value. Make sure to let the pressure out with the air valve then slowly turn the liquid valve. You must balance them so liquid and gas comes out grab the hose and insert it into your container. Fill it up a little bit then pour it out so that you clean the container completely. Then fill it up ? of the way full and put the cap on and run like hell. Do not fill it all the way full because it is under pressure and will explode if you do. If you container is not sealed it will all evaporate quickly so make sure to use it with in a couple of hours. If you container is sealed you will not smell it leaking and should be able to make a couple of ounces off a large fire extinguisher full!