The sound of metal scraping on concrete (ie construction equipment)
People that light up a smoke on the phone while getting techsupport (I get back at them, I eat chips and carrots with out turning off my mic)
Seeing improper care of animals in petstores.
When customers call me for help and then put me on hold (often they get disconnected when they do that).
Callers that argue about what they need to do to fix their printer, they called ME for help. If they know what the fix is why did they bother calling in the first place?
Micromanagement (one of my supervisors does this @ work, if anyone were to cause me to go postal she would)
I've got more but those are off the top of my head.