Un chien andalou (1929, 156MB, 15:40 min.)

This is just the source.
Can you imagine Cocteau, Deren, later Hitchcock & Cronenberg
without this?
Oh..more:- the whole of cinema would have a great gaping bloody gap
in it & what was left would be dull dull dull & Black Francis wouldn’t have been
able to write ‘Debaser’.
It simply prised open the language.
Afterwards, Bunuel went on to make some of the sharpest, most provocative
& disturbing films of the 20th century & Dali went on to
…well… be Dali.