What's the worst sound in the world?

[TableSalt]

-ear rape and heart attack warning-
I just found this video and it made me wonder if you guys could find any worse-sounding things that aren't just extremely loud.
There's also this.

[Ad Bot]

[InvisibleName]

my left ear really enjoyed the first one

[Sitrus]

A falling shepard's tone sounds really unsettling
https://www.youtube.com/watch?v=u9VMfdG873E

[shitlord]

https://www.youtube.com/watch?v=Dp3BlFZWJNA

[HooperScooper]

nails on anything

[TableSalt]

nails on anything

nails on wood
nails on graphite
nails on nails

[XR-7]

I sometimes piss off my family by digging forks into ceramic plates. It doesn't bother me but everyone else is practically falling over from cringing.

[Freek]

https://www.youtube.com/watch?v=i67HtgDKsrU

[Mr Man]

-ear rape and heart attack warning-

Saving this to watch high

[Yosher]

http://vignette3.wikia.nocookie.net/nuclear-throne/images/8/89/Captain_Player_Dies.ogg/revision/latest?cb=20151013222042

[Drydess]

op's voice

[SBG]

https://www.youtube.com/watch?v=t1PT_BgRtk0

[Afraidanna]

these infinite fractal things confuse me

[bestguy22]

blockland death sound

when people rub their fingernails on that one ssurface. like, you probably know what im talking about rihgt? it sounds like a disc or someone pulling their zipper up and down but the feeling of doing it and the noise makes me cringe so hard

[kongo]

2 pieces of styrofoam rubbing against eachother