Simple things that used to scare you.

[Houdini]

Dogs, because I was bitten by one. I'm not afraid of them any more. I want a doggie ^0^ arf arf

[Nyerp]

THEY'RE STALCHILDREN NOT ZOMBIES

[superclucky]

Oh, Yoshi's Island's last bowser battle scared me. <3

[CutLess]

The haunted house level in Banjo-Kazooie used to scare me.

I was also afraid of playing hide-and-go-seek, but that was mainly because my brother was a dick and would act like a ghost to scare me.

[greg400]

The piano that randomly started attacking you really fast in the haunted house level in super mario 64. I shit my pants when it first startled me

[Hiro]

Oh my god me too, that thing was scary as fuck.

[Hiro]

I also agree with mirrors at night, zombies in oot, and ww floormasters

[Tobin Coziahr]

RE4...It still does.

[Selkie]

The super zombie freak things in Ravenclaw in HL2

Scariest moment I have experienced in a video game I think.

[Sam]

The haunted house level in Banjo-Kazooie used to scare me.

I was also afraid of playing hide-and-go-seek, but that was mainly because my brother was a dick and would act like a ghost to scare me.

Oh nononono, the haunted House Level in SM64, as well as the eel in the lagoony level. ;-;

[Hiro]

PLAYSTATION FOUR.

[Samus Aran]

Mickey Mouse. I had this rather creepy Mickey doll that seemed very menacing sitting up on a shelf at night with the dim glow of a night light on it. So yeah, back then that made Mickey rather frightening for me. I think I was about 3 at the time. Maybe 4.

[ncba93ivyase]

Early 3D games due to the feeling of such a limited universe.

They still scare me, actually.

[bluaki]

Numerous things in Ocarina of Time, especially the ReDeads and Floor Masters. The versions of those in Wind Waker and whatever other games aren't nearly as bad.
The mini-scene whenever link puts on a transforming mask in Majora's Mask
The stuff in Luigi's Masion used to be a little scary to me.
Walking around in the dark because I always felt like I was going to trip over, run into, or scratch myself on something.
People coming into my house at night. I used to even double-check every door before going to bed to make sure they're locked well.
The possibility of people looking through my windows.

[Hiro]

Sometimes i look being shower curtains before i pee so i know nobody is watching