Answer:
I am expelled from you orally with a sound
What can you lose that will cause other people to lose theirs too?
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.
I am in the past, never in the future. I don't exist, but have existed. I saw what you saw, and this is what I will ever see. What am I?
I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?
I'm the source of all emotion but I'm caged in a white prison.