Chris told Oprah his experience with Dr. Gates was unbelievable. "Even while it was going on, he was telling me, 'Your great-great-grandfather owned property,' and 'Your great-great-grandfather did all this stuff.' I thought I was being punk'd. I really did," Chris joked. "I thought Ashton Kutcher was going to come from behind something and go, 'You know your grandfather was nothing but a slave. You know he just mopped up for white people. Come on, we got you.'"