Ken's comment on that: "Believe me, I was enjoying (almost) every second. Getting beat on the buzzer is frustrating, but are you kidding? I AM PLAYING A PRIME-TIME GAME SHOW AGAINST A SUPER-ADVANCED ROBOT! This is the coolest thing I will every do in my life by a factor of a million. The future is here."

From a chat he did at http://live.washingtonpost.com/jeopardy-ken-jennings.html?hpid=talkbox1