Has a minor incident angered you immensely?
Has a very minor, even innocent, event angered you so badly that you still think about it and get very angry over it to this day?
I'm not asking what your pet peeves are, not asking about something that would be expected to make you mad. I'm asking about an incident that you didn't expect would make you mad, and you don't really have an explanation as to why it makes you so mad.
Please comment.