couldn't you release a script online that runs this command, elevates the user to root, disables the firewall, enables vnc and then sends you a message letting you know that the machine is now open for the season? I don't know how many people look at scripts that they download, but I am sure there a quite a few who would download a script that claims it does something involving itunes. They wouldn't even look at what it does, and their machine would be "penetrated" btw, that was funny as hell.