Sara. I'd agree with your selection, though Bunuel has some moments in most if not all his films.

John. There is a thread for The Wayward Cloud - LINK, a few of us have seen it and it certainly belongs with the surreal and outrageous.

On top of these, another definite would be Battle in Heaven - LINK

Definitely a few of Miike's films, "Dead or Alive", just sickening, "Gozu" surreal, bizarre and extremely boring and most of all "Visitor Q" which makes a determined effort to break every taboo, necrophilia and incest amongst many others.

Of course there are many others as well such as "Salo, or The 120 Days of Sodom" by Pasolini and La Grand Bouffe by Marco Ferreri.

Darren Aronofsky with "Pi" and "Requiem for a Dream", come to think of it Sara, you've really opened up a can of worms here, there are loads stretching right back to the dawn of cinema.

Should provide some interesting discussion though. 

Cheers Trev.