Answer:
What goes through a door but never goes in. And never comes out?
Today he is there to trip you up. And he will torture you tomorrow. Yet he is also there to ease the pain, when you are lost in grief and sorrow.
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Sometimes I am loud. And viewed with distaste. Poke out my 'eye', then I'm on the front of your face.
My first is an insect; my second is a border; my whole puts the face in a tuneful disorder.
When is it bad luck to see a black cat?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?