One of the most interesting things for me was Steve Jobs' facial expressions as he was sitting on the chair demonstrating the iPad.

http://www.youtube.com/watch?v=9eVCFXxgn2M&feature=chann...

After practically every phrase, he tightly closes his mouth. It made it seem, to me at least, that he really didn't believe what he was saying. No doubt having an audience of millions contributed to him wanting to carefully control anything that comes out of his mouth, but it was hard for me not to get that impression.