Sound that drives you insane.

[soes757]

Crushing ice with your teeth, not because the sound really bothers me, but because when people do it I get cold.
My girlfriend has one about a fork on teeth, and oddly enough not a fork on a dinner plate or on metal or on anything of the sort, just teeth.

 

[Longstreet]

Styrofoam.

Always when someone makes that stuff make any sound at all near me i feel the urge to violently remove their hands so they can never touch anything ever again.