Dead Space freaked me out the first time I played it, like DOOM 3. Games that rely on jump scares however, will grow old quickly. RE 4 though, I find terrifying at times. I'll never forget having a Regenerator come after me, especially when in the lab and I'm frantically aiming with my sniper rifle, reloading after each shot, with that thing barely 20 feet away from me, still having to shoot it another four times. That was brilliant. Or being in the castle gardens and hearing the dog growls constantly without being able to see them until the very last second.