This one is particularly vile because it can cause harm to animals.
It is also patently absurd, because it's backwards depending on where you live.
I was informed just this week by several intelligent, educated North Americans that they were unaware that...
Black Cats are considered GOOD luck in Britain, and other places.
Wikipedia offers a theory as to how Americans got it twisted:
As it's obviously ridiculous that an animal can be both good luck and bad luck, this should be the very first superstition you throw out, but do me a favour and throw them all out while you're at it.
Gratuitous 1970s music.