For BP, it's basically nothing, or excessive prolonged stress, or travelling across multiple timezones and not sleeping. (Whee!)

For agitation and annoyance, the list is MUCH longer. A sampling:

•Encounters with rude entitled people
•Kids crying or being loud or obnoxious
•Children's songs
•Music I don't like played loudly (If I like it, no problem, lol!)
•Inconsiderate behavior (oh, where to start? )
•Being repeatedly talked over (this happens a lot)
•Uncertainty. Important things all up in the air.
•The sound of empty aluminum cans and bottles getting pressed or clinked
•The sound of dishes being put away

Better stop there.