I'm not talking generic things like floorboard creaks and girl screams. What's the most unusual (but terrifying!!) sound?

For me it's the bloody flash wind-up on these things. Scary as hell.

For me the sound when you flush the toilet after you used it on an airplane

Acelerate a dit :

For me the sound when you flush the toilet after you used it on an airplane

OH JFC YES LMAO

When suddenly I hear an unexpected waterfall of rain on my window like jesus christ

When I screech so loudly my head shakes and feels like it'll explode. It happens.

Nails on chalkboard..when I hear noises like that I have to like my fingernails.O_O

Acelerate a dit :

For me the sound when you flush the toilet after you used it on an airplane

I'm so glad you agree.

A crash/creak/footstep. While your in the bathroom..

My singing.

Engines revving.
or god forbid i hear buzzing around me

anything really loud makes me feel anxious

Bouncytree a dit :

A crash/creak/footstep. While your in the bathroom..

Omg yes. .3.

Acelerate a dit :

For me the sound when you flush the toilet after you used it on an airplane

this kills me

When people slide a metal spoon and a fork together

THE SOUND MAKES ME SHIVER FOR SOME REASON AFF

Acelerate a dit :

For me the sound when you flush the toilet after you used it on an airplane

+1

After I flush I put my hands over my ears and get the hell outta there.

The strange sound of tapping/collision of something followed by complete silence when I'm using the bathroom..

All of the above mentioned

https://www.youtube.com/watch?v=kffacxfA7G4

This is the key to your soul being devoured by Satan, having absolute hell visit you in your nightmares, and worst of all, hell...