Transcript for '500 Questions' Behind the Scenes
Finally tonight, it calls itself one of the toughest game shows devised. 500 questions pitting genius against genius. We sat down to get answers. Your road to 500 starts with the first ten categories. Reporter: That's ken Jennings and the Dan Harris we know and love. He's host of -- The toughest game ever devised. France has a land border with what eight countries? Spain. Andora. It's crazy the amount of knowledge these people have. How much money have you made doing game shows? Somewhere north of $3 million. Answer as many questions as you can, three in a row wrong, and you're gone. This is a serious moment. One more wrong and you're out. You can see him struggle and the fear in their eyes. Yes, and I think it was not about the money. It was about the pride. Luxembourg. Belgium. Reporter: Mr. Jennings earlier tonight was knocked out. You might be the least intelligent person on this show. It's an intimidating person to host, but I feel more secure now that I'm standing here with you. Looks like fun. 500 questions airs here on ABC. We wish Dan a great run. Go get them, brother.
This transcript has been automatically generated and may not be 100% accurate.