Answer:
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
Voiceless it cries, Wingless flutters, Toothless bites, Mouthless mutters. What is it?
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
You can see nothing else, When you look in my face, I will look you in the eye, And I will never lie.
What is so fragile that saying its name breaks it?
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?