Are black cats bad luck or good luck?

I've always been fascinated by the question of whether black cats bring good luck or bad luck. On one hand, some cultures view black cats as omens of misfortune, often associating them with witches and dark magic. But on the other hand, other cultures see black cats as symbols of good luck and prosperity. So, I'm curious, what do you think? Are black cats bad luck or good luck? Is there any evidence to support either side of the argument? I'd love to hear your thoughts on this intriguing topic.