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In page The Discreet Charm of the Bourgeoisie:

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Buñuel and Silberman travelled to the US in late 1972 to promote the film. Buñuel did not attend his own press screening in Los Angeles and told a reporter at Newsweek that his favorite characters in the film were the cockroaches. While visiting LA, Buñuel, Carrière and Silberman were invited to a lunch party by Buñuel's old friend George Cukor, and other guests included Alfred Hitchcock, Billy Wilder, George Stevens, Rouben Mamoulian, John Ford, William Wyler, Robert Mulligan and Robert Wise[4] (resulting in a famous photograph of the directors together, other than an ailing Ford). Fritz Lang was unable to attend, but Buñuel visited him the following day and received an autographed photo from Lang, one of his favorite directors.[5]