I was planning to comment on this after hearing Yahtzee's Review of Alien Vs. Predator, and interestingly enough, watching Terminator 2.
Imagine, if you will, going down a corridor of some game in a FPS, and along the way, you get a message that comes on screen, a voice message from one of your crew you had to get seperated from, calling and asking for your help. Not screaming, but freaking out. Suddenly, you go back to find them only to find out that nothing was really happening, but it's your radio screwing up. Now, you can't trust everything your radio says, because it could walk you into a trap. I think it should also go for maps. If you access a map, it'll show one path, then it'll show another, and another. Now you don't know which map is trustworthy, if monsters or what have you will kill you of it's people that might be able to help you.
I think limiting ammo would definitely make games scarier, and then leaving you unarmed when you lose all your ammo. Suddenly, it becomes a matter of paying closer attention to your surroundings. Something could be behind you, and then again, you just don't know.
The last one involves health. I think health restoration is a good idea, but to a point, really. In reality, when you are winded or have been hurt, you get second wind, sure. But to have your health restore almost enough to where you were with 100 full is a bit crazy. Restore five or ten points and that's it. I don't think you need to have your health become full to appreciate it more, but make health seem less and less likely to get back.
Also, when you are injured, make it like real life, where you do things slower. Say you've had half of your health bar shaved off, well now loading your gun takes a few more seconds, maybe 10 seconds or 15 seconds, to even so far as 30 seconds. With creatures all around you, now you can't afford to screw up. Suddenly watching "Terminator 2" makes much more sense, doesn't it?In Terminator 2, Sarah Connor gets seriously hurt, and when she loads her shotgun for the upcoming onslaught of the T-1000, she takes some time to load her shotgun, this takes a painful couple of seconds, unlike FPS's instant ammo loading, where two shells and you are full.
Maybe impliment a "Second Wind" option, where you focus which is more important: Health, Weapon's Usage or Speed. You now can choose to focus your health to restore faster, your ability to load a weapon faster or the ability to run faster. It will definitely make your game scarier to play.
What does everyone think?