“MAD [magazine] has never been successfully sued, but that hasn’t stopped people from trying. The magazine once received a letter from Lucasfilm’s legal department after their Empire Strikes Back parody, demanding that they recall all printed copies of the issue and destroy them. MAD replied by sending a copy of another letter they had received the previous month—from George Lucas, offering to buy the original artwork for the Empire parody and comparing Mort Drucker to Leonardo Da Vinci and the parody’s writer, Dick De Bartolo, to Mark Twain. They never heard from Lucasfilm’s legal department again.”

-- Grady Hendrix in his article, “Cahiers du CinéMAD,” about the history of MAD magazine's movie parodies, in Film Comment. Here's a Wiki list of MAD's film spoofs. The first I remember is “A Crockwork Lemon.”

Two panels from MAD's 1977 parody of “Star Wars.”