Answer:
I'm the source of all emotion but I'm caged in a white prison.
Use me if you really want to see inside someone
What do you get when you cross a snowman with a vampire?
A prisoner is told 'If you tell a lie we will hang you if you tell the truth we will shoot you.' What can the prisoner say to save himself?
Everyone has me and no one can lose me. What am I?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.