A man ghostly walking into a chamber with roundtable of gentleman and ladies talking about something they only understand. Suddenly the room become silence as they fear about this man will only laugh to their low quality conversation. What's the use to discuss something unuseful, or in fact it's not the content of conversation that matters? But the act of conversation it self? Then why don't you guys just write a paper with a label "We are having a conversation, and a quality discussion?"
Lately, I understand this kind of question silence the room everytime I enter.