Aaron86: If we're going to be talking about the Half-Life games, I better mention this part in Half-Life 2: Episode 2. I'm going through these abandoned buildings to reach the car, and at one point there's a poison headcrab zombie in a locked closet. It's moaning freaked me out the first time I played through this part, mostly because I heard it before I could see it and because it almost sounded like it was singing.

Charon121: Oh yes, I'm arachnophobic too. I stopped playing Doom 3 on the level where you first encounter those spider demons. Just quit the game and uninstalled it a couple of days later. Before buying a game, I now usually check whether it contains any spiders and how ugly they are. If it does, I might be able persuaded to play it, but only if I find a detailed enough walkthrough listing every enemy's location, so that I cannot be surprised/jumped by them.

Incidentally, what game has the worst spiders? For me, it's Thief 1. Such an old graphics engine, yet they move in a disturbingly realistic way.

EC-: Inching forward in X-COM, that terrible ambient track gnashing your ears (in a good way) as you progress. Then suddenly, shots at your squad! You see the shots, you hear them, but the enemy remains hidden. X-COM freaks you out with what it doesn't show you, like any great horror.

Charon121: Incidentally, what game has the worst spiders? For me, it's Thief 1. Such an old graphics engine, yet they move in a disturbingly realistic way.

Strijkbout: More recent, Stalker SoC had some really creepy moments and an excellent atmosphere that go with it.

Gazoinks: Skyrim

Charon121: They were scary, but actually among the least scary ones in computer games. I guess tarantulas don't get me as much as spider species with long, thin legs and no fur.

Gazoinks: Clearly you didn't look at the link I posted. :P