Posting a cartoon image of a black cat on a door or window is one of the traditional ways Americans invite children to ring our doorbells on Halloween night.
For some sick souls, however, Halloween suggests other ideas involving black cats. Some members of the Church of Satan like to gross people out with a "sacrifice."
So, heed Nancy Czerwinski's friendly warning...
This blog recommends bringing all urban and suburban cats inside (at least inside a shed or garage), having fish for dinner and giving them a portion for their "treat," and thinking of other nice things we can do for other animals to make up for the nastiness of other members of our species.