Clay Aiken cast in 'Monty Python's Spamalot'

NEW YORK "The first time I saw it I thought it was the stupidest thing I'd ever seen in my entire life," the "American Idol" runner-up told Newsweek. "My tour drummer is the 'Spamalot' drummer, and (he) said you've got to see it again."

Aiken plays one of the leads, Sir Robin, in the Tony Award-winning musical in a stint from Friday through May 4. He told the magazine he was so sore from rehearsals he "couldn't even get off the toilet the other day."

"It hurts so bad. I don't know if it's I'm not coordinated or using muscles I never had to use before," he said.

The show is based on the film "Monty Python and the Holy Grail," which came out in 1975, a little before the 29-year-old singer's time.

"I thought Monty Python was a person until three months ago," Aiken told Newsweek for editions on newsstands on Monday.