RISE - The Elemental Bill...
My wife has worked with invisible thread and I called her in to see the bill float. Her eyes were darting around, up and down and then she just looked at me. I asked her if she could see the thread. She said no and thought I was playing a trick on her and was doing something else. I had her tap near the bill and only when it bounced did she believe me.
Zombie Magic on The Magic Cafe