Lesson #708 - Audience Participation

I'm sure there are reasons why the speakers do it, but really, who isn't irritated by this type of opening? Frankly, I've only ever found it effective when the speaker seems mildly deranged and starts off by yelling "I WANNA ROCK" and the audience shouts "ROCK" in response. But then, that led into a talk about enzymes, so it was really the best part about the talk.