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In page Andy Kaufman:

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During this time, he continued to tour comedy clubs and theaters in a series of unique performance art/comedy shows, sometimes appearing as himself and sometimes as obnoxiously rude lounge singer Tony Clifton. He was also a frequent guest on sketch comedy and late-night talk shows, particularly Late Night with David Letterman.[6] In 1982, Kaufman brought his professional wrestling villain act to Letterman's show by way of a staged encounter with Jerry "The King" Lawler of the Continental Wrestling Association. The fact that the altercation was planned was not publicly disclosed for over a decade.[citation needed]