As far as bizarre and uncomfortable art films go, Nicolas Winding Refn's Valhalla Rising is pretty tame. In fact, it is so comparatively tame that the film's marketers felt they could serve it up as an action-packed Viking film—a terrible decision that caused the film to be a horrendous flop; because after all, this is a bizarre and uncomfortable art film. When I say "tame," of course, I do not mean it does not have an explicit evisceration scene—because it does—I mean it has a relatively discernible plot and characters with names.
The protagonist, One Eye (Mads Mikkelsen in a stark, fearsome performance), does not say a single word in the entire film. The other characters do a lousy job of filling in the silence, for I think I counted somewhere in the vicinity of twenty-four lines in total.
In addition to long periods of silence, the film also features clay-covered voodoo rock men, inverted dream sequences (I think), and a lot of existential symbolism—making it, without a doubt, a very bizarre and uncomfortable art film.
(Disclaimer: The film features starkly beautiful cinematography and brilliant performances. Certainly worth watching)