David Letterman Continues to Poke Fun at Jay Leno

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"Are you crazy about how fast the summer has gone by? I mean, we're already in August and it just shot by. I was talkin' to my mom earlier today and she said, 'David, try to look on the bright side. Six more weeks til Jay is back!'" —David Letterman's first monologue joke from last night's Late Show [Late Show With David Letterman]