[this diary rescued from oblivion by force majeure]
The Corner has a link to this goodie, which includes video. Obama gets out of sync with his best friend the TelePrompTer. The audience chuckles politely at his subsequent strained attempt at humor. What I think is funny besides the obvious is that he catches himself and stops before using the word "TelePrompTer".
If you can't trust your TelePrompTer, who can you trust? Can you imagine the field day Olbermann and friends would have had with Bush doing this, proving what a mental midget he was?