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David Letterman laughs while Bill Murray speaks after jumping out of a cake during one of the final shows in the final week of The Late Show with David Letterman, May 19, 2015 (Credit: CBS/John Paul Filo)

David Letterman laughs while Bill Murray speaks after jumping out of a cake during one of the final shows in the final week of The Late Show with David Letterman, May 19, 2015 (Credit: CBS/John Paul Filo)