Un cadavre (A corpse) is a 1930 virulent pamphlet against André Breton organised by Robert Desnos to which dissident surrealists such as Georges Bataille contributed. Its title was based on a 1924 pamphlet by the Surrealists against Anatole France. Read more here.
The quote in the title of this post was taken from the Louis Aragon contribution to the 1924 pamphlet and translates as: “Have you ever slapped a dead person?”