All hail Bubba, king of ad-libbing
Bill Clinton ad-libbed a significant amount of his speech, over 2,000 words of it.
"Numerous times during Clinton’s peroration, which eventually drew to a close just before eleven-thirty, the machine appeared to have conked out, the same words frozen on the screen," said the New Yorker. "It hadn’t backed up; it had simply stopped because the former President had departed from this prepared remarks, which were pretty long to begin with, and ad-libbed to his heart’s content"
The text: "I believe that with all my heart."
The speech: "Whether you believe it or not, I just want you to know, with all my heart, that I believe it. I believe it. Let me tell you why I believe it."
Text: "It gets worse."
Speech: "Folks, this is serious, because it gets worse. And you won't be laughing when I finish with this."