[Dark Hunter]

I'm astonished no one's mentioned the Replica Assassins from F.E.A.R. yet. Forget Alma, those things were spawned straight from the pits of hell...

Nearly invisible, jump around like Spider-Man on crack, can kill you in like two hits, and there's that creepy electrocution thing they do if you happen upon one before it notices you... They're tied with Fast Zombies for being the only game enemy that has legitimately frightened me.

[NGTM-1R]

The Redead just amused me. I didn't find anything in Zelda OoT terribly threatening, which is sortof necessary for fear...

[Halleck]

You know, I had forgotten how terrifying those Zombies were in OoT, becuase they were laughably harmless after you obtained the sun song. But before, hearing that screech was definitely a an "oh sh**" moment.

[Klaustrophobia]

I'm astonished no one's mentioned the Replica Assassins from F.E.A.R. yet. Forget Alma, those things were spawned straight from the pits of hell...

Nearly invisible, jump around like Spider-Man on crack, can kill you in like two hits, and there's that creepy electrocution thing they do if you happen upon one before it notices you... They're tied with Fast Zombies for being the only game enemy that has legitimately frightened me.

that electric arc noise gives me the shivers, because it makes me think one just dropped right behind me from the ceiling and is about to separate my head from my body.  but in an actual fight with one, no worries.  it didn't take me long to learn to just stand still and scissor kick them when they rush at you.  and of course this is all the FEAR 1 assassins.  the ones in 2 were just laughable.

other than the shadow temple/bottom of the well for general atmosphere, nothing in OOT was really scary/creepy for me. 

[Dark Hunter]

Well, I didn't say they were scary because they were hard to fight. Slo-mo + shotgun to the face = dead assassin, every time. (In fact that works for just about everything short of Powered Armor.)

I can't deny that their introduction in FEAR 1 was just about the scariest thing I've ever seen in gaming, though. Ten minutes of wandering around a giant office building and nothing attacks you, and then all of a sudden... HOLY **** INVISIBLE ELECTRIC NINJAS!

I'll give FEAR credit for one thing, it knows how to build a damn creepy atmosphere.

[Blitzkreig]

Bloodsuckers and snorks from the game S.T.A.L.K.E.R. are pretty damn scary, especially while using the Narodnaya Soljanka mod.

[Jeff Vader]

Bloodsuckers and snorks from the game S.T.A.L.K.E.R. are pretty damn scary

Haven't run into snorks yet (I should really continue S.T.A.L.K.E.R. again some day), but bloodsuckers were quite .

[Kszyhu]

I don't know, bloodsuckers were more dangerous than scary, although hearing their roar in the middle of the forest could raise the blood pressure. Well, once I was checking out a stash in between some buildings, and one of those bastards decloaked and attacked when I couldn't see anything. I was so startled I've used entire magazine, even though it was dead after few bullets. In other situations they were smart, flanking and partly invisible, but more unsettling than scary.

[headdie]

Bloodsuckers and snorks from the game S.T.A.L.K.E.R. are pretty damn scary, especially while using the Narodnaya Soljanka mod.

They defiantly get the creepy scary vote but the

Spoiler:

telepathic things

get the scary from a gameplay pov

[Dragon]

If you want to see really scary version of Bloodsuckers, try Nightstalkers: Shadows of Namalsk. http://forums.bistudio.com/showthread.php?t=118731
They come at you out of nowhere, kill in few hits, take a lot of bullets to kill and are faster than you. Coupled with the atmosphere of the mod, these things can give you a heart attack.
Also, cloaked Drillers from the first Descent. Other bots were capable of being scary, but hearing a whine of a Driller and not seeing one could be the scariest thing in the entire game.

[ReeNoiP]

Lickers in RE2 used to scare me. That sound they make 
<edit> Youtube for effect.

Birkin with his slow walking, don't care if you shoot at me -SLIDING CLAW SWIPE routine was also quite intimidating.

Pyramid head was pretty freaky as well.

I don't really get what's scary about Ravenholme. It's seems almost cartoonish and is basically a playground where you kill zombies in creative ways with the gravity gun.



 

[Vidmaster]

HEADCRABS...     bbbbbarrrrggghhh

[Mongoose]

Also, cloaked Drillers from the first Descent. Other bots were capable of being scary, but hearing a whine of a Driller and not seeing one could be the scariest thing in the entire game.

Heh, I was going to mention some Descent stuff myself.  Drillers were pretty scary as a whole, but the cloaked versions were doubly so.  And those Fusion Hulks...I have that sound they make seared into my brain.  The Old Scratch in D3 was pretty scary in its own right.

[Commander Zane]

Fusion Hulks had the most awesome sound.
Red Hulks were like OHSHI---

[Ravenholme]

Lickers in RE2 used to scare me. That sound they make 
<edit> Youtube for effect.

Birkin with his slow walking, don't care if you shoot at me -SLIDING CLAW SWIPE routine was also quite intimidating.

Pyramid head was pretty freaky as well.

I don't really get what's scary about Ravenholme. It's seems almost cartoonish and is basically a playground where you kill zombies in creative ways with the gravity gun.

It was scary at first, built up a great atmosphere, but yeah, after a while it lost the scary aspect. Interestingly enough, it doesn't have that last 'e', it's "Ravenholm". My name comes from before Half Life 2, when I was obsessed with Morrowind (my chronic character was a dark elf spellsword called Ravenholme)

[starbug]

hmm, tough one, as not many games i found the monsters scary, but if i had to choose some i would go with

The Bruiser brothers from Doom, (the 2 Barons of hell you face at the end of Knee deep in the dead) When i first heard their screams i jumped, bare in mind i was only young kid at the time, and how tough they were. They there was the CyberDemon.

The Pyramid Head from Silent hill, wasn't that scary but most of his appearances were just totally f**ked up esp that scene where it rapes the mannequin monster.

Alma from Fear 1, but i think thats more down to scripted events.

The Zombie (infested) crew members in System Shock 2, just creepd me out, when they charged at you askin you to kill them or run.

[Colonol Dekker]

As a retail Freespace 2 moment.....


DIVE DIVE DIVE


Made me **** bricks the first time

[Ravenholme]

As a retail Freespace 2 moment.....


DIVE DIVE DIVE


Made me **** bricks the first time

Retail Freespace 1 and your first encounter with the Shivans scared me. "OH GOD MY GUNS THEY DO NOTHING O**** THERE GOES ALPHA 2"

[headdie]

As a retail Freespace 2 moment.....


DIVE DIVE DIVE


Made me **** bricks the first time

Retail Freespace 1 and your first encounter with the Shivans scared me. "OH GOD MY GUNS THEY DO NOTHING O**** THERE GOES ALPHA 2"

the first mission on the bastion was scarier, i found not being able to detect or quickly kill the scorpion irritating more than scary, but that mission when the depot erupts in explosions and the Shivans truly demonstrate their superiority.

[karajorma]

I'm going really old school on this one. The tyrannosaurus from Where Time Stood Still. All you here is the thud of footsteps and then the suddenly appears and eats half your party.