OK since most of us on here are pretty much desensitized...

[plan9superfan]

"Kiiiiiiri, kiri, kiri, kiri, kiri..."

[Neville]

Strangely enough, the "kiri" word brings me fond memories of the cheese brand of that name.

[Chopper]

well off the top of my head -- a couple films that always send shivers down my spine are Henry: Portrait of a Serial Killer and the Hills Have Eyes (original).

[dean]

There's always a few, but I guess it all depends on what sort of film you want to watch.

Wolf Creek spooked me out for a bit and I really enjoyed it [head on a stick is not very fun]  John Jarrat is a great serial killer in that film.

Other than that, also off the top of my head, are films like "I Spit on Your Grave" which really isn't fun, but rather very nasty [rape makes for such a 'fun' movie], as well as "Fight For Your Life" which is somewhat similar in style but deals more with racial violence.  Ouch.

[onionhead]

I agree with Henry:  Portrait of a Serial Killer, also Manhunter.   The end of the original The Fly did and always will give me the willies--"heeeeeelp meeeee, heeeelp meeee . . .!".

[plan9superfan]

What about the ending of the remake?

[odinn7]

^ ^ ^  Broken record....