Sort of like novacaine.
Seriously, I'm numb. This isn't a joke. I can't feel anything. I have no empathy. Emotions have no effect on me. I don't care about you or anything you do. Pain and pleasure are physical anomalies which I can not experience. I get the sense that my threshold for pain is such that you would get more of a response from a strip of leather. I've completely lost touch with what makes me human. I can only fake it for so long.