Dead Space 2
"They're swarming into the Medical Deck. At least you won't have to go through there."
"Unexpected obstruction detected. Shutting down. Welcome to the Medical Deck!"
- Ellie Langford, Automated Tram Announcer, and Isaac Clarke
The Ishimura was the location where all but the last chapter of the first Dead Space game took place. There were plenty of terrifying things that we all had nightmares about for weeks (Nope, just me?) and we hoped that we'd never see that dreaded ship again.
And then you're forced to return in the second game for a chapter or two.
Having to relive through some of the same situations as the previous installment actually ended up being worse than the original run, because this time I knew what terrors were laying in wait. It doesn't help at all that your character Isaac experiences frequent hallucinations, so you don't actually know if these monsters are real or not until they get right in your face.
The revisit to the Medical Deck was the worst bit. In the first game you're chased by a creature that is impossible to destroy by normal means, and revisiting its original chamber was nerve wracking to say the least. The part I remember being freaked out by the most is going through the decontamination chamber (in DS1, you are attacked by a horde of Necromorphs), but nothing happens. I walked so slowly out of that door it was almost comical. Of course, when you go back through it later all hell breaks loose. So I guess my paranoia was justified after all.
The first game wins in the overall scary category, but its the fact that you had to relive it again makes it worse.