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Piers Morgan Jokes About Punching Larry King (VIDEO)

01/21/2011 09:02 am ET | Updated May 25, 2011

Piers Morgan joked about punching Larry King Thursday night on "The Late Show with David Letterman."

Letterman told Morgan that his show would only take off if a guest punched him on-air — or, even better, if he punched a guest.

"You need to grab somebody by the tie and just pop him," Letterman said. "Just a short right cross and then it would be fantastic."

"Would it work if it was Larry, or would it be seen a bit too cruel?" he asked, referring to King, whose show he replaced at 9PM on CNN. "Joking!" he said to audience jeers.

"I'd like to see you punch a 78-year-old man," Letterman said.

The pair also discussed Morgan's UK newspaper career, his walk on the beach with Rupert Murdoch, and Ricky Gervais' Golden Globes hosting job.

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