I don't get why people who decide to attend an industry lecture, knowing very well that it is an uncompulsory lecture and that the contents covered will not be tested, only to end up their own work right in front of the guest speaker. If that's the case, I'd rather them not sit in at all. If you attend the lecture to make the lecture hall less empty, please don't do work when you're sitting somewhere very visible to the speaker, otherwise what you're doing is just gonna have the opposite effect. Where's the basic respect? Can you put yourself into the speaker's shoes? I'd feel demoralised presenting to 90 souls but only 5 humans. I probably would have just skimmed through the entire lecture but the guy had actually went through it in such detail and took 1hr 50mins. (Although I did hope that he would have shortened it...) What's bad was that most people didn't even try listening; they went there with the sole motive of doing work. Kudos to our generation.