"Sit back down - and for God's sake quit trying to be as nasty as I am; you don't have my years of practice.  Now let me get something straight: you are not in my debt.  You can't be.  Impossible - because I never do anything I don't want to do.  Nor does anyone, but in my case I am always aware of it.  So please don't invent a debt that does not exist, or before you know it you will be trying to feel gratitude - and that is the treacherous first step downward to complete moral degradation.  You grok that?  Or don't you?"