"For the most part, improvising while cameras are rolling is very difficult. 99% of people you should never ask to do that, because they're under pressure, the clock is running, 80 people are staring at you...it's always unnatural."

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The trouble with the jokes is that once they're written, I know how they're supposed to work, and all I can do is not hit them. I'm more comfortable improvising. If I have just two or three ideas and I know how the character feels, what the character wants, everything in between is like trapeze work.

— Stephen Colbert