There are many superstitions associated with cats, partly because the cat has lived alongside humans for many millennia. The cat was worshipped in Egypt and to kill one was considered a capital crime. When an Egyptian family's cat died, the cat was mummified and the family went into mourning. Romans, also, considered the cat sacred and introduced it into Europe. By the 17th Century, however, the cat began to be associated with witchcraft and its luck turned from good to bad in many areas. A practice that became popular for a time was to burn cats and other animals on Shrove Tuesday (before the start of Lent), in order to protect one's home from fire and other calamities.
Superstitions centering around the black cat are some of the most well-known and popular superstitions today. It is interesting, though, because the good or bad luck they possess is dependent on where you live in the world. In Britain and Japan, having a black cat cross your path, is considered good luck, whereas if you live in the USA or several European countries, it is bad luck to have a black cat walk by.