Letterman has always been an oddball, having so much money, a poduction company, hosting his own talk show but still a shut in. Whenever celebereties call him to hang out he always starts coughing really loud saying, "Man, I\'m really fighting off something serious." Just as an obvious excuse for him to stay home.
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He\'s setting up remote cameras around the city, so he\'s obviously gonna do something different, maybe even go outside and do some skits like he once used to do. Sounds good to me.