For me it's my neighbours' dogs, who bark endlessly, night and day, and who have come perilously close to incurring my wrath on a number of occasions.
As genuinely annoying as I know they are, it troubles me deeply to know how irritable and easily enraged I am about very trivial things. Honestly, the slightest annoyance or irritation can send me to levels of spontaneous rage that make me want to smash things and scream obsenities at anyone close enough to hear. It's frightening, and distressing, and I'm not doing a good job at keeping on top of it at all.
Something in the original post here made me really sad, something about the irritation at something in nature that really should be so pure and simple and good. I think I feel that way a lot lately, annoyed and almost resentful of beautiful and simple things, like children, and people laughing, and so many things that seem to make other people so happy. It makes me really sad, and deepens my feelings of isolation and aloneness in the world, and makes me wonder if i'm turning into the endlesly bitter angry person I never wanted to be.
Maddog