I have noticed that it has become fashionable to put little black mice and rats on your Halloween stairs/tables/vignettes. I had a quiet chuckle to myself, because, I lived on the Isle of Man (In the Irish Sea) for quite some time. The inhabitants of the island are very superstitious. They seriously believe in fairies, and leave messages for the fairies to ask for help, pinned to trees at Fairy Bridge. Even the famous TT motorbike riders go to fairy bridge to ask for help!
Anyway, they believe that rats are bad fairies. The word rat is not allowed to be uttered on the island. They use the word 'long-tails' instead! I learned this the hard way by uttering the word rat naively at work one day. The whole office descended into a black silence.