THAT scene in the basement...

Though it was fictitious, it unnerved me.

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Yup, gives me the creeps! Just saw it again today!! I remember being terrified when I saw it at a cinema when it first came out, it's very effective in the dark ;)

Prepare to evacuate soul.

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Yes probably the only scene not picturing the actual murders that chilled me to the bone. The set up by Fincher was brilliant though. From no car to rainy stormy weather outside to the slow revelation that the guy was the one who did the writing on the poster, to the creepy basement, the footsteps upstairs to the locked doors and of course the perfect casting of that weirdo opposite Gyllenhaal. It was so perfectly constructed that it couldn't fail. Fincher the ultimate director!

Why did he go down there?!?!? Just say I'll wait up here for you, and get out! I understand it was for the movie but I was creeped out way before he went down there.

Who was the person walking upstairs?

Utterly terrifying. It always gives me the creeps. I re-watched it all alone last night, and shortly after, once I was about to fall asleep, it came once more to my mind, so I had to get up and watch a few cartoons 

Animal crackers in my soup
Monkeys and rabbits loop the loop