oh honey. get some duct tape and tape the cat's feet and tail. that's a really funny way (and a very mean way) to get back at your intruder.

Can you be certain that this cat is not in possession of, or developing, weapons of mass destruction?

This cat may be planning an attack on you. A preemptive strike is in order here (and you'll be greeted as a liberator by the other cats in the area, I promise).