Most flustered Ali G guest of all time
There are lots to choose from, but my personal pick is the episode with Vietnam Vet Dr. George Washington. Ali G was in top form in this 'interview', relentless in an endless list of incredibly stupid queries.
Poor Washington alternated between correcting Ali G's silly statements and giving long stares of incredulity. Ali was great in thoughtfully looking at GW as if he was engrossed in the interview.
However, the coup-de-grace was the long shot of Washington at the end, shaking his head several times in disbelief....