Answer:
What is put on a table, cut, but never eaten?
What doesn't get any wetter, no matter how much rain falls on it?
I love to dance and twist and prance. I shake my tail, as away I sail. Wingless I fly into the sky.
Flat as a leaf, round as a ring. Has two eyes, can't see a thing.
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.
You use it between your head and your toes, the more it works the thinner it grows.