Many years ago I attended a small scientific conference that P&T were also attending. They weren't presenting; they were just in the audience listening because they're interested in science. One presenter was having great difficulty with the A/V equipment. This went on for about 10 minutes and the audience was growing frustrated but we were all too polite to say anything. Finally one guy stands up and says -- very loudly -- "My name's Teller and I'm a professional magician and I know a little bit about A/V equipment. Would you like some assistance?"

The guy has no problem speaking when he's off stage.