I am your teacher and I think it right and proper that I should let you know something of my plans for this class. I tried to pitch my voice into its most informally pleasant register. We are going to talk, you and I, but we'll be reasonable with each other. I would like you to listen to me without interrupting in any way, and when I'm through, any one of you may say your piece without interruption from me." I was making it up as I went along and watching them. At the least sign that it wouldn't work, I'd drop it fast.