name a sound that's really hard to ignore?

Fingernails on a blackboard come to mind

I hate the fire alarms that are installed even when they have finished going off you still hear them, ringing in your ears.

i also hate the alarms with the radio playing and then the high pitch noise in between it, that is soooooooooooooooo annoying

The old fashion nails on a chalk board the noise makes me wanna scream!!!!!!

Breaking glass, a gun shot, explosions, the sounds of war.

A baby crying from frustration because he can't tell you what's wrong, your grown child crying because she's just gotten her heart broken, people sobbing at a gravesite.

The noise of Y!A users squealing when they get emails saying they have lost points for posting the same question more than once.

Siren for radio trivia

A screech owl

The sound of your heart beat... When you're trying to sleep and you can't stand it.

Isn't it funny? You're being annoyed by your own being!

fire alarm at two in the morning or that noise that jim carrey makes when he wants to be annoying sort of a shrill throaty high b flat

Crying baby.