Bad cats are tough to catch. When you're not looking, they're doing bong hits. As the month progresses, your liquor gets more and more watered down, until the bad cat "accidently" knocks over the bottle so you have to buy more alcohol. When you're at work, the bad cat brings home dirty, nasty, skanky cats that are full of greasy fleas and they screw them on your pillow. They drink from the milk carton when you're looking the other way. Those dead mice you find were a combination of Feng Shui and Cthulhu worship, except you keep stumbling onto the rituals before the bad cat can set the house aflame.

You never know when you have a bad cat until it's too late.