One lesson I learned from attending VC meetings. Questions asked by VCs are not always honest questions. While some of the questions are asked because they are genuinely curious, some are asked a) to see if you know what you are talking about, and b) to see if you can see straight. So if you are asked a seemingly dumb question by a VC, give it all you got. VCs know that smart techies tend to underestimate VCs and will take advantage of that. A single dumb answer can tilt the VC's opinion of you.