Comment by Magic Marmalade:
Undeliverance.
I have a vague memory of this coming out at the time, and being rather dismissive of it, thinking it was just going to be a cheap, throwaway shlock-fest comedy horror... which it is, mainly, except for the throwaway part. As this has actually got a genius concept at it's heart, and does one of my favourite things in cinema:
Subvert the audience expectations and preconceived notions.
...Even use them to bamboozle the audience, and lead them down a wrong alley or two.
Most recently, Get Out was lauded, and is laudable for having done this very thing to great effect, but this has a truly great spin on expectations, as it uses the trope, the stereotype even of the down south hillbilly redneck types being weird, perverted savages as the basis of a misunderstanding between them who are the good guys, essentially, and the young and innocent college kids who go into their neck of the woods to camping, setting up what the experienced horror fan might expect to become a kind of Friday The 13th / murder on the lake slasher affair - and in fact, the college kids, who have this preconception of Tucker and Dale end up being the cause of the horror (mostly to themselves :), with their intolerant attitude causing them to demonise our heroes, and mistakenly set against them.
It's a horror comedy of errors, which actually could be Shakespearian in it's farce of misunderstandings, misconceptions and basically getting the wrong end of the stick (literally, in a couple of cases!).
But better than all of this, it's just great fun, and is a deserved modern cult classic.
It won't undo all the damage done to the image of our Southern American friends by movies like Deliverance, Southern Comfort, Easy Rider etc. but it must be nice for them at least, not to be on the end of a reputational kicking for a change, with a couple great affable guys in the movie to get behind.
Brilliant.