Sarah Palin and William Shatner

Sarah Palin made a surprise stop on her book tour, popping up on The Tonight Show Friday after William Shatner performed one of his dramatic readings from the former governor's new book, Going Rogue: An American Life.

"I think Bill did a great job," said Palin as Shatner's bongo accompaniment died down. "I think it's only appropriate that I read a few choice excerpts from Mr. Shatner's autobiography, Up Till Now."

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Palin read excerpts about Star Trek, T.J. Hooker and even Johnny Carson.

"As I finished 'Mr. Tambourine Man,'" Palin read, "I glanced over at Johnny Carson, who had a look of astonishment on his face vaguely similar to the look on Spock's face when his brain was missing."

Check out the rest of the sketch in the clip below. What did you think of Palin's appearance?