Ordinarily, disciplining is just part of the job of a pet owner. You're not sure, however, if that extends to satanic rites. In any event, discretion is the better part of valor, so you shut the door, letting the cat have his privacy, and high-tail it out of there.
You realize something is wrong as soon as you get outside. Could he have finished the ritual already? The sun is blood red, casting an unholy glow over everything. People are scream, crying, or dead, all of them. They've been ripped to pieces, but there's no sign of what did this.
Then comes the sign. It comes as a low rumble from behind you. You turn in time to see a huge demonic feline with slick fur and dripping fangs as it mounts your home, easily gliding over the whole structure as it prowls towards you.