But as Grignon drove north, he didn’t feel excited. He felt terrified. Most onstage product demonstrations in Silicon Valley are canned. The thinking goes, why let bad Internet or cellphone connections ruin an otherwise good presentation? But Jobs insisted on live presentations. It was one of the things that made them so captivating. Part of his legend was that noticeable product-demo glitches almost never happened. But for those in the background, like Grignon, few parts of the job caused more stress.

This is the story behind the unveiling of the first iPhone on June 9th, 2007. A nice read on the NYT.

Here is the video if your memory is failing you.