During a recent visit to the set of Scary Movie 4, Entertainment Tonight got a chance to chat with Dr. Phil and Shaq about their cameos in the beginning sequence of the film which is a parody of last year's horror hit, Saw.

"It all takes place in this nasty, filthy bathroom [where] Shaq and I are chained up together," explains Dr. Phil, "and the way out is you've got to cut body parts off to get loose, so he and I are wondering which one of us will wind up doing it."

Starring 'Scary Movie' regular ANNA FARIS, the new one, in theaters next April, marks Dr. Phil's big-screen debut -- spoofing his own image. "I want people to know I don't take myself too seriously as it might seem when I am into a heavy issue," says Dr. Phil. "I always try to work with humor as much as I can because it diffuses a lot of [people's] defensiveness. I think it's good to make fun of yourself."

As for real scary movies, Dr. Phil says he loves them. "They say you have to have this suspension of disbelief, and I can totally get into a movie and have that," he says. "When I am in it, I totally immerse myself in that movie, and the goofier they are, the goofier I get; the scarier they are, the more chicken I am."