Not a quote, but when he was sliding down the deck of the boat into the shark’s maw. My heels dug grooves into the theater floor in front of my seat. I’m pushing on the floor right now.
From IMDB: http://www.imdb.com/title/tt0073195/quotes
Hooper : You were on the Indianapolis?
Brody : What happened?
Quint : Japanese submarine slammed two torpedoes into our side, Chief. We was comin’ back from the island of Tinian t’Leyte, we’d just delivered the bomb. The Hiroshima bomb. Eleven hundred men went into the water. Vessel went down in twelve minutes. Didn’t see the first shark for about a half hour. Tiger. Thirteen footer. You know how you know that in the water, Chief? You can tell by lookin’ from the dorsal to the tail. What we didn’t know, was that our bomb mission was so secret, no distress signal had been sent. They didn’t even list us overdue for a week. Very first light, Chief, sharks come cruisin’, so we formed ourselves into tight groups. It was sorta like you see in the calendars, you know the squares in the old calendars like the Battle o’ Waterloo and the idea was the shark come to the nearest man, that man he starts poundin’ and hollerin’ and sometimes that shark he go away… but sometimes he wouldn’t go away. Sometimes that shark looks right at ya. Right into your eyes. And the thing about a shark is he’s got lifeless eyes. Black eyes. Like a doll’s eyes. When he comes at ya, he doesn’t even seem to be livin’… ‘til he bites ya, and those black eyes roll over white and then… ah then you hear that terrible high-pitched screamin’. The ocean turns red, and despite all your poundin’ and your hollerin’ those sharks come in and… they rip you to pieces. You know by the end of that first dawn, lost a hundred men. I don’t know how many sharks, maybe a thousand. I do know how many men, they averaged six an hour. Thursday mornin’, Chief, I bumped into a friend of mine, Herbie Robinson from Cleveland. Baseball player. Boson’s mate. I thought he was asleep, Reached over to wake him up. He bobbed up, down in the water, he was like a kinda top. Upended. Well, he’d been bitten in half below the waist. Noon the fifth day a Lockheed Ventura swung in low and he spotted us, a young pilot, lot younger than Mr. Hooper here, anyway he spotted us and a few hours later a big ol’ fat PBY come down and start to pick us up. You know that was the time I was most frightened? Waitin’ for my turn. I’ll never put on a lifejacket again. So, eleven hundred men went into the water. Three hundred and sixteen men come out, the sharks took the rest, June the twenty-ninth, nineteen-forty five. Anyway, we delivered the bomb.
Jacobean tragedy is full of creepiness, really – this image from The Duchess of Malfi has always given me the willies:
One met the Duke 'bout midnight in a lane
Behind Saint Mark’s church, with the leg of a man
Upon his shoulder; and he howled fearfully;
Said he was a wolf, only the difference
Was a wolf’s skin was hairy on the outside,
His on the inside; bade them take their swords,
Rip up his flesh, and try.
Midnight Radio makes a good point. This one (it’s translated in the story) means “No one insults me with impunity.”
Does “Apres nous/moi le deluge” mean “After us, the flood”?
WRS - Je nye govoryu zai frances.
Indeed, it does. And my French is probably not much better than yours.
“no, no, son, this is different eggs - and I feed them meat”
- Ivor Cutler, Egg Meat
Since posting the entire lyrics isn’t allowed I hope 2 verses is allowable
I rode a tank.
Held a General’s rank
When the Blitzkrieg raged
And the bodies stank
I watched with glee
While your Kings and Queens
Fought for ten decades
For the Gods they made
Rolling Stones: Sympathy for the Devil.
Most of that literary stuff isn’t scary or bloodcurdling. Not really. Not when compared, in context, to a classic like “Here’s Johnny”. Clever, poetic, and to a certain form, sure, but not to curdle the blood.
There are, of course, exceptions. Take E. A. Poe, please.
See ya, Rodney. Now you’ll get some respect. 
Sometimes the truth is stranger than fiction:
Can’t remember the name of the book, except for the quote below it was easily forgetable.
A doctor was on trial for adbucting, torturing, and murdering several women. During the trial he remained silent. When found guilty and sentenced to death the judge asked if he had anything to say.
He rose, smiled, and said, “They were so beautiful in their agony.”
Very close.
The flood in this case refers to the one in the bible that old Noah survived.
In other words, we’ve fucked shit up so bad that all we have done will be destroyed for its evil.
Deliver in a gay, light hearted tone of voice that makes it clear that you’re having the time of your life, and it does become rather frightening.
There a phrase that Germans use that I think is a translation of the French one.
“Nach mir die Sintflut.”
My favorite scary quote is pretty much just a reflection on the evil that lurks within the common man:
“Well I skipped dessert, I betrayed the jew. I hide in the mirror and I’m and I’m pointing at you. I started all the rest, I’m working on World War Three. I’ve got a mean streak.”
Zodiac Mindwarp and the Love Reaction - Meanstreak
metal fan reporting in 
Hated that book.
When cannibal Alferd Packer was sentenced to death the judge added, “Ye murderin’son of a bitch, there was only six Dimmycrats in the county, and you et four of them!”
Well, it’s not bloodcurdling like many of those above, but I find the implications of this one scary.
It’s from Walt Kelly’s comic strip Pogo, which I’m not generally a fan of. But someone cut this one out and stuck it on the side of the card catalog in the Engineering Library at the University of Rochester. The speaker is the titular Pogo Possum. It takes two panels, but I’ll condense it into a single quote:
“There are folks who think that there are beings smarter than us in the Universe. There are others who think that we’re the smartest.
Either way, it’s a mighty humblin’ thought.”
“Before we’re through with them, the Japanese language will be spoken only in hell.”
- Admiral “Bull” Halsey
"It came with the wind through the silence of the night, a long, deep mutter, then a rising howl, and then the sad moan in which it died away. Again and again it sounded, the whole air throbbing with it, strident, wild and menacing.”
― Arthur Conan Doyle, *The Hound of the Baskervilles *
I read this story when I was twelve, alone in my room by flashlight. To this day I get chills whenever I hear dogs, coyotes or wolves howling in the night.
"I suggest you remember that my operatives would avenge my death -
and some of them… are Vulcans. "-- Mirror Spock
I’ve taken out a lot of your post because it posted the full lyrics to the song. One or two lines are okay, but posting entire lengths of it can run afoul of the “Don’t post copyrighted materials here” rule.