Knives are see as a small version of swords; crossed swords is a sign for war, conflict, danger etc. hence crossed knives are seen as unfortuitous.
Also during the 17th and most of the 18th century and earlier sword dueling took the lives of many male family members throughout Europe until outlawed. At the beginning of every duel the protagonists crossed the tips of their swords and then began the duel to injury or death. Thus in Europe it became a sign of bad luck and possible death of a family member to leave knives crossed and every time they were found crossed to uncross them to relieve this potential bad luck.
If a black cat comes across your path, it is considered bad luck. It could, however, just be superstition. Perhaps...
crossing your fingers represents the snake on a flag pole which is very bad luck.
For the myth, it would be considered 7 years of bad luck.On another note: Black cats are not a sign of bad luck, that is just an old myth. Cats are black because of there dna/genes NOT because they are bad luck, because they are NOT.
It is not considered bad luck.
It is not considered to be bad luck to wear a Claddagh if you are not Irish. In fact it is considered good luck.
Beliefs about crossing stairs bringing bad luck range among cultures and individuals. Some people might also consider it bad luck to go anyone on the stairs due to superstitions or cultural traditions, while others can also now not consider such notions. Ultimately, whether or not crossing stairs is viewed as a terrible success depends on non-public beliefs and cultural influences.
A jinx.
No, black is not considered a bad luck color in dogs.
It depends upon where you come from. In various places around the world, a black cat (and all other cats) are considered good luck when they cross your path. However, if they sit down in the middle of crossing your path or if they bolt across in front of you, it's considered bad luck. In America and Britain it is considered bad luck for a black cat to cross your path, however, if you stroke the cat's back four times take a step away from the cat, and spin three times, the bad luck is said to go away. Of course, all this only applies if you're superstitious. If you're not then I guess you're only viewing this because superstition interests you. :)
Wu Mei was considered bad luck by her family because her mother died while giving birth to her. They told her that she "caused her mother's death" and that she must be bad luck.
It is considered bad luck because it wastes nourishment for the whole family.
Number 13.