The King of Late Night is still at work

Johnny Carson and David Letterman seen back when they were both still on NBC.

Does Jay Leno know? CBS senior veep Peter Lassally revealed Tuesday at the TCA press tour that some of the jokes David Letterman tells during his Late Show monologues are written by none other than Leno's Tonight Show predecessor, Johnny Carson. "He gets a big kick out of [hearing Letterman pull his punch lines]," Lassally said. Jay, dude, that's gotta hurt. (Michael Ausiello - TV Guide Online)