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Nightmare Fuel: Alone in the Dark
The first game:
The ghosts; if you touch them, they come to life and chase you everywhere, with a constant demonic groaning noise, and Interface Screw via the screen shaking.
Reading "De Vermis Mysteriis" causes your character to utter a horrified moan as an unseen force bodily lifts them up, and then very quickly and with no warning snaps their spine in half and hurls their broken body back to the ground.
You are walking along hoping that you don't get attacked by another dog, when all of a sudden you hear a scream and when you walk toward the scream, you hear a splash and then the game turns quiet for a second.
Before entering the mansion, there's a change that you might encounter a group of ghosts that show up during lightning strikes.
The 2008 game:
The park can be creepy; going around in a lonely silent place, and then you find an incredibly strong monster.