Apple keynote bloopers
Okay, I've seen a gazillion of these in Microsoft keynotes and demos so before you ding me, I know we have way more than Apple does. This Soapbox video is a Sunday smile though as I'd always thought Steve J's demos were letter perfect. I now know it happens to him too :)
I also found a link on KnowHR to Unbelievably Bad Presentations that included this but you'll be pleased to know there are a few Microsoft ones there too!