or fall asleep during the presentation. Ok, you are too busy, or the talk may be too boring. Then, you should be aware that you have missed something. So, if you want to ask a question at the end, you should start with "Maybe I missed it. Why this and that?" Don't just jump in: "We have done this and that..." What you have done may be great, ok, let's assume you are great; but you are off the point (because you were late or fell asleep).