I can get one leg to move on its own, I can get one arm to move on its own but I cannot get one eyebrow to move on its own. What can't you do?

I am really good with the Spock eyebrow thing. However, the third finger of each of my hands curves in toward the top. It feels quite awkward to type an A or a Z, and I have never been able to hold a pen as others do. I rest the pen on the third finger of my right hand, and it feels comfortable and normal to do so. If I attempt to hold a pen or write in the normal way, my hand won't move smoothly.