Don't even think about it...............the days of boys having fun have long gone.

Schools, colleges, employers, and the law take a very dim view of this sort of thing and totally overreact in many cases.

If you fill their hard-drive then you will crash the computer.............that is a CRIMINAL offence in many countries.

The only time you might attempt such a thing is if you own the machine in question.............and somehow I just know that you don't