(Laughter) So when that happens — this works in Keynote, PowerPoint, it works in every program — all you do is hit the letter B key, B for blackout, to black out the slide, make everybody look at you, and then when you're ready to go on, you hit B again, and if you're really on a roll, you can hit the W key for "" whiteout, "" and you white out the slide, and then you can hit W again to un-blank it.