Here's one answer that showed up in my feed reader this morning:
"And prepare for the worst in AV problems. I once heard Denis Reggie present an entire program without one slide when the AV system blew up. He never missed a beat and the audience never cared. His message was solid and he knew his material so well that he didn’t need his slides!"
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"And prepare for the worst in AV problems. I once heard Denis Reggie present an entire program without one slide when the AV system blew up. He never missed a beat and the audience never cared. His message was solid and he knew his material so well that he didn’t need his slides!"
(http://mei500.com/blog/2009/10/so-you-think-you...)
Of course not everyone is capable of pulling something like that off.