A black cat is a bad omen
In the Middle Ages, people believed that a black cat was a witch — or at least a witch's messenger. Hence, many thought any encounter with the creature was a bad sign. Some people say the bad luck comes only if the black cat walks toward you; it's a good omen if he walks away. Regardless of the legend's veracity, animal shelters report that black cats are less likely to be adopted than orange ones.