what are the films that you found to be the most disturbing, but not because of being gory or visually disgusting? said films can be graphic, but that should not be the main reason you found it disturbing.
some of mine, that come to mind:
oldboy - original
spoorloos
the seventh continent
benny's video
poughkeepsie tapes
hard candy
the mist
confessions
the treatment
the tortured
seven days
kill list
we need to talk about kevin
funny games
cache
irreversible
Just out of idle curiosity, are you an Aussie? I'm a Yank. (Or do folks in other countries call us something else?) I do a lot of traveling. I've been to all 50 states and 26 other countries. In July I'm going to Kenya and Tanzania.
out of your picks i would say that "spoorloos" is my fave, which is also in my top 10 films of all times. the first time i watched it, i was almost traumatized. after multiple viewings that feeling turned into pure fascination. i have seen it like 10 times by now.
close runner up is requiem, but i am a bit afraid to rewatch it, since it is so unbelievably dark. ironically i have no problem rewatching most haneke films, which are even more devastating like benny's video or seventh continent, but requiem is one tough cookie.
there are also a lot of ulrich seidl movies that i still have to watch, but i have to be in the mood for such a bleak vision of reality. i highly recommend him and haneke in general.
actually i am from iowa, but i travel a lot. mainly in the uk area though.
i think the last time i have been called a "yankee" must have been either late 80s or early 90s. xD
I'm from Ohio, but I've been called a Yank by posters from other countries.
Requiem For a Dream is my favorite, though I'm not sure I would want to watch it again. Spoorloos was the most suspenseful and frustrating (No! Don't get in his car!)
But for sheer full on creepiness, no film can touch Eraserhead. It gave me the heebie jeebies, and I know I never want to watch it again.
BTW I've visited all of the UK except for Wales. I love it.