Andy Kaufman fights Jerry Lawler on Late Night
It's unclear whether or not Andy Kaufman's infamous fight with Jerry "The King" Lawler was real or not, but it seems quite likely, given their relationship. The two were invited onto Letterman's show to work things out, but Lawler ended up striking Kaufman across the face. Later, Kaufman delivered a profanity-laden rant against both Lawler and Letterman.