There used to be a person like that in one of my classes, and I remember being driven to distraction by it, I was so sick of it that one day while the teacher was trying to engage the class in a discussion she called on me and asked me what I would predict in a certain sceneario, and I blurted out I don't know but I can predict what will happen in this class during the next one and a half hours, you will review some information from our reading assingment, and then so and so will raise his hand and ask a ridiculous question that you will attempt to answer and you will keep answering his querries until the class is over.