Have you ever been in a meeting where you had no idea what everyone was talking about but were afraid to ask any questions for fear of looking look a dork? Then read this post by Rick Nason.
Similarly, I am always troubled when someone gives a presentation and nobody asks any questions and you see nodding heads and glazed eyes. This usually means nobody understands anything and/or they have no vested interest in either position so agree by default. Watch for this and think about this quote from William Wrigley Jr (the gum guy): “When two men in business always agree, one of them is unnecessary.”