Yeah, what happens when they have the same countermesures in place. Your two boxes would end up DOS'ing eachother.

Just make sure you watch what you are doing. If you get caught hacking their system, its just as bad, and I have seen the government run tests where they will do something like portscan a machine, and see if the machine trys to retaliate. It was always done on other government computers, but a few people have lost their jobs over it. Its better to just have a message automatically sent to the machines admin, or the isp.