Answer:
I will disappear every time you say my name.
Goes over all the hills and hollows, Bites hard, but never swallows.
When I am caught I am thrown away. When I escape you itch all day.
People make me, save me, change me, and raise me. What am I?
A butcher is 6 feet tall and wears size 12 shoes. What does he weigh?
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.