Actor Paul Rudd; retired basketball player Shaquille O'Neal; comic Hannibal Buress.

Contestants' knowledge is tested with 13 true-or-false trivia questions but with a cunning twist: Just how well do they know what they know ... and, just as importantly, how well do they know what they don't know? If they can accurately predict how successfully they've answered 13 questions, they could take home a $1 million cash jackpot.