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.
I can run but not walk. Wherever I go, thought follows close behind.
Two bodies have I, though both joined in one. The more still I stand, the quicker I run.
My thunder comes before the lightning. My lightning comes before the clouds. My rain dries all the land it touches.
Runs smoother than any rhyme, loves to fall but cannot climb.
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?