Chris Rock in 1997

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Chris is no stranger to an O.J. Simpson joke—Simpson was the punch line in many of Chris' shows. "I made a lot of money off O.J.," he jokes. So when Chris received a phone call from Simpson back in 1997, he admitted on a past visit to The Oprah Show that he was a little nervous. "O.J. called me up, and you know, when he gets your number—you get a little scared," he said.

Simpson left Chris a voice mail, which he jokes was a little creepy. "Hey man, you dogged me in your last show—but I understand," Simpson said in his voice mail.

After seeing the old clip from 1997, Chris jokes that more has changed than just Oprah's hairstyle. "With the money I made from those Simpson jokes, I bought some new teeth!" Chris says.