And white ones too.
In the US, they say that it's bad luck if a black cat crosses your path and good luck if a white one does. Over here they also say that the black cat means bad luck, but I never believed that. In fact, I’m convinced it’s the opposite.
In Scotland, however, they say that the black cat brings good luck, but if a white cat crosses your path it's bad luck! That can’t be right, either. Especially since I have two white cats of my own! I believe all cats bring good luck.
I’ve also read that killing a black cat on Halloween will bring 7 years of bad luck. That’s not the whole truth. In fact, killing any kind of cat, at any time, will bring 17 years of bad luck according to some. Others say it’s the same as sacrificing your soul to the Devil. Or at least it should be, to anyone who intentionally would harm a cat, if you ask me. :)