A lot of Black Sabbath stuff, actually, because if you're in a certain frame of mind the lyrics start to hit uncomfortably close to home.

Like Supernaut, for instance:

got no religion, don't need no friends
got all i want and i don't need to pretend
don't try to reach me 'cause i'd tear up your mind
i've seen the future and i've left it behind

One night my cousin & I downloaded some random song entitled "I Eat Poop" at about 3 in the morning & it was the most fucked up thing I have ever heard.

Nearly anything by Penderecki.
The famous Threnody for the victims of Hiroshima, for example.
Kandu vs. Corky (Horrorca) by Kayo Dot's leader Toby Driver, too.

Uh, almost every Xiu Xiu song, Bad Moon Rising, Confusion is Sex, some of the SY album...

I love listening to confusion is sex at three in the morning, I also listen to Nine Inch Nails at that same time.

"New Love Grows On Trees", Peter Doherty
"The Crawl," Placebo
and oddly "Carol of the Bells" has always freaked me out.something about it...

CIS creeped me out and still does. But I love it.