Black mEtal is pretty sinister stuff, but can be unintentionally humourous.
The first song on Black Sabbaths first album, i cant remember what its called thats pretty dark and so is Dazed and Confused by Led Zep. "Hunted by a freak" by Mogwai is pretty dark too. Mogwai are an amazing band if you have not heard them you check them out
Finest Hour by Willhaven, sounds like something Satan would play as you were descending into hell, and the acoustic section at the end just emphasises the horrible noises that preceded it.
Row Boat by Coal Chamber, not a particulary scary song at first, but Dez Fafara's voice sounds so disgusting and unhuman when the guitars fall away, it makes my skin crawl.
Dance With The Devil by Immortal Technique, one of the most shocking and sickening songs I've ever heard, made worse by the fact that it's actually a true story. There are people who actually go out and do the kind of messed up shit Tech raps about.
hypocrisy - slippin away
http://www.mp3search.ru/m3u.html?id=196031
really wierd and depressing song