This is an EXCELLENT topic!
Of all the scary moments, no one can top this one:
The SCARIEST moment in the game... left me screaming and crying. I'm not exaggerating, either.
FYI, I'm not easy to scare... unless I'm playing Calling.
Keep in mind that I always play Calling in the dead of night to get that full horror feeling.
...This moment only happens when you do the replay of a certain one of the chapters in the Kuromiya Hospital. Unfortunately, I don't remember which one, so you'll have to find it for yourselves.
I was wandering one of the halls in the hospital, exploring the chapter for any extras my friend Grudgie and I may have missed, when we spotted something strange down the hall...
We immediately heard that familiar ringing that the bad ghosts carry with their presence, and we saw something in front of one of the hospital rooms: Facing the door to the room were TWO BARE FEET.
Prepared to face any upcoming ghost attacks, I walked the character over to where the feet were standing... When approached, the feet walked through the door and into the room it held. Carefully, I opened the door, only to find that the Mnemonic Abyss was behind it, waiting for an unsuspecting player to carelessly stumble into it.
Grudgie and I were a bit relieved to know that we didn't have to fight off another ghost, so we stayed in Look Mode at the door for a while, discussing whether or not the feet we saw were there for no particular reason but to look creepy. We enjoyed the relaxing silence that followed the event.
...But after closing the door and exiting Look Mode, a whispering voice broke the silence:
"You should have fallen....."
I dared not turn around until that ringing sound was gone again!