I watched Black Swan.
It affected me in a very personal level.
I really understood the psychological scenes because I had experienced it myself.
As I how I had mentioned to my friend,

"Other 'normal' people would just find it weird, or vague, but to me, it was very scary. Like reliving my scariest moments".

Like what the review in Guardian.Co.Uk calls it, - "a psychological horror, quite mad and often really scary"