Click to viewSince it's Halloween over at the io9 offices, we couldn't help put plug our brains into our hive-mind computer and put together a list of the 50 scariest moments in science fiction movie history. These are the moments that stuck in our minds, disturbed our dreams and made us see ordinary objects as monsters waiting to strike. Here's our definitive list of the most terrifying scenes from the most horrific scifi movies. Day of the Triffids (1962) Scariest moment: Watching people stumble blindly into menacing plant creatures. Dr. Jekyll and Mr. Hyde (1931) Scariest moment: When Hyde abuses Ivy, the dancing girl.

Invasion Of The Body Snatchers (1978) Scariest moment: Pointing and screaming was never so scary, until they brought in the human dog face alien. Doctor X (1932) Scariest moment: When we finally see the vat of plastic skin.

Signs (2002) Scariest moment: The first camera footage of the alien walking across the shaky cam. "Move, children. Vamanos." It (1990) Scariest moment: When the creepy clown monster emerges from the drain and pops his head into the shower. No lie, I took baths for two weeks after it. Phantasm (1979) Scariest moment: When the spikey alien orb sucks the bad guy's brains out in the mausoleum. Village of the Damned (1960) Scariest moment: When the glowing-eyed, alien-enhanced children mind-control a guy into shooting himself. Peeping Tom (1960) Scariest moment: When the killer, who has been deranged by his mad psychologist father, finally reveals his weapon of choice.

The Day the Earth Stood Still(1951) Scariest moment: When Gort is about to kill our heroine, and she has to scream "Klaatu barada nikto!" at him until he chills out. Murders in the Rue Morgue (1932) Scariest moment: When we finally see the mad doctor's diabolical scheme to put the blood of an ape into the body of a nubile, caged woman! Creature from the Black Lagoon (1954) Scariest moment: When the creature first climbs out of the water. Jurassic Park (1993) Scariest moment: Samuel L. Jackson's arm. I Walked with a Zombie (1943) Scariest moment: When we find out what the plantation owners really are up to. Quatermass and the Pit (1967) Scariest moment: When scientists first start investigating the strange spaceship buried deep underground and people start having strange visions.

The Descent (2005) Scariest moment: The over the shoulder crawler that appears for the first time after the lights go out. Them! (1954) Scariest moment: Any scene with the giant ants.

Cat People (1942) Scariest moment: When the cat-shaped shadow stalks our heroine around a pool. Godzilla (1954) Scariest moment: When Godzilla attacks Tokyo and we see graphic imagery of people being burned to death. Scanners (1981) Scariest moment: Scenes in the hospital where scanners are first created. Manchurian Candidate (1962) Scariest moment: Shaw's mother. The Birds (1963) Scariest moment: Stuck in the attic with a bunch of pissed off birds. Basket Case (1982) Scariest moment: What happens when the psychically-linked, freakishly-deformed, formerly-Siamese twin brothers have sex.

Cloverfield (2008) Scariest moment: The tunnel part. "Okay, just to be clear here, our options are: die here, die in the tunnels, or die in the streets. That pretty much it?" God Told Me To (1976) Scariest moment: St. Patrick's Day Parade . . . of death! Carrie (1976) Scariest moment: When Carrie kills her mother, and the final goodbye. Night of the Living Dead (1968) Scariest moment: What happens to the family that decides to hide in the basement. Predator (1987) Scariest moment: When the predator climbs out of the water right over Arnold, who is covered in mud. Invasion of the Body Snatchers (1956) Scariest moment: "That's not my husband." Forbidden Planet (1956) Scariest moment: When the astronauts are hiding in the ship and the perimeter alarm goes off, despite the fact that nothing seems to be outside.

The Signal (2007) Scariest moment: Mya trying to leave the apartment without pissing off her rage crazed hubby, after he's just offed a few of his buddies. The Cabinet of Dr. Caligari (1920) Scariest moment: When a victim runs through the streets, fleeing the murderer, and everything is built to look like a scary expressionist dream world. The Blob (1958) Scariest moment: When the tiny blob makes its first kills by creeping into lonely houses at night.

Event Horizon (1997) Scariest moment: "Where we're going, we won't need eyes to see," says the lovely Dr. William Weir after ripping out his own eyes. The Fly (1986) Scariest moment: The total fly transformation right in front of Geena Davis' eyes. Cabin Fever (2002) Scariest moment: The shower scene where Marcy innocently begins to shave off layers of her skin.

The Ruins (2008) Scariest moment: When the group discovers their little blond friend all bloody and a mess from knifing herself open in search of the plants growing inside of her. The Cell (2000) Scariest moment: Vince Vaughn's insides getting pulled out by hand. Jacob's Ladder (1990) Scariest moment: Getting busy on the dance floor, evil lizard style.

Fire In The Sky (1993) Scariest moment: When the wrinkled aliens plastic wrap the idiot human, and then start to work on him. The rest of the movie is pretty ho-hum, but that one scene will stick with you for days. The Thing (1982) Scariest moment: After tying up half of the cast on the bench, Kurt Russell then slowly proceeds to test each character for monster blood. Try not to bite your fingernails off as he tries to figure out who's the murderous creature in human form. 28 Days Later (2002) Scariest moment: Empty London. Dawn Of the Dead (1978) Scariest moment: It's a tie between watching the motorcycle gang get their guts pulled out, and watching Stephen transform into a zombie. Alien (1979) Scariest moment: The infamous dinner alien-busting-out-of-the-chest scene. True it's been spoofed to death, but the first time you see it, it's a classic scare. Communion (1989) Scariest moment: Christopher Walken playing peek-a-boo with alien invaders. The Brood (1979) Scariest moment: One word: fetus. Dreamcatcher (2003) Scariest moment: Damian Lewis is pretty damn creepy in this movie, but the best scene is Jason Lee versus the toilet alien - right after the weary traveler craps it out. Christine (1983) Scariest moment: When the evil Plymouth Fury happily flashes it's light as a girl chokes to death in the passenger seat and the people outside helplessly look on. Slither (2006) Scariest moment:The high tension zombie slug in the bathtub scene.

Frankenstein (1931) Scariest moment: It's alive! Aliiiiiive!