Random bouts of anger plague me quite often, and usually for no good reason. For example, people who chew loudly or with their mouths open can send me into a rage, when really the most I should feel is slight annoyance. Sometimes even the sound of someone speaking is enough to make me super angry!
I think it's something that a lot of people with Borderline struggle with. The important thing for us is to learn good techniques to control our anger.