Answer:
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.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
They can float and tickle, but their sound is rarely heard unless you're a pillow or bird. What are they?
Pirates put their booty in it.
Different lights do make me strange, thus into different sizes I will change.
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?