Answer:
At night I come without being fetched. By day I am lost without being stolen.
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
Look into my face and I'm everybody. Scratch my back and I'm nobody.
A home of wood in a wooded place, but built not by hand. High above the earthen ground, it holds its pale blue gems. What is it?
I can ruin your day, or darken your life. And while I'm expected, I'm never alright. I'm bad for business, and worse for your hair. Wherever I am, there's something not there.
When is it bad luck to see a black cat?