So, here's the scene. You turn up to OSCON. You're talking to Larry and Damian about your latest module,
Acme::Jam, they're agreeing and telling you how cool you are. You can't put a foot wrong. You bounce down to the front of the auditorium to begin your talk, go full-screen and..
..it's too late. They've seen the Powerpoint window. Larry sighs, and you can see Mark-Jason Dominus mouth "re-tard-o" at you from the back.
I gave a talk on MagicPoint to london.pm tonight. I think it went okay. Slides and source available here.