What I hate is when I'm on the phone with someone and they allow their kids to scream and cry in the background and don't do anything to shut them up. My husband's cousin's family is notorious for this. All was quiet when he was talking to the lady of the house but as soon as he handed the phone to me her little angel let out a blood-curdling scream that nearly blew my brains out like a sledge-hammer! I have Asperger's Syndrome, which means I often experience sensory issues, especailly where sound is concerned. There are certain noises I find literally physically painful and the sound of a screaming baby is the worst. THere is no way I can concentrate with that going on in the background.