They've been a part of it for a while and prior to an exclusive niche category Jeff used to tailor questions to the guests. The personal aspect to all of the characters is what makes this competition more entertaining than your average trivia match. Its fun to see things like Carl study up on anime. Last night Donny knew both anime questions even though it's kenjacs category. Each team has an equal opportunity to zero in on something they feel confident about. Don't pick a giant category that your opponents see all the time like a sport, get creative and play the game.