ENTERTAINMENT

Jon Hamm's Old Job: Nudity And Hot Dogs (VIDEO)

03/18/2010 05:12 am ET | Updated May 25, 2011

Before he was Don Draper, Jon Hamm worked behind the camera--as a set dresser on "those late night movies that appear on Cinemax," he told David Letterman Friday night.

"There's a certain amount of nakedtivity on these," Letterman pointed out. "Are you allowed to be there when that happens?"

"People tend to make up excuses for how important they are on the set," Hamm said. "It's a closed set so only vital personnel are there. Then you see the guy that runs the craft service thing kind of eating a hot dog and staring at it. And it's like, why does Jimmy need to be here?"

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