I rant. Silently. Hard to explain, but I find a quiet place, say a room that no-one else is in, then start to construct arguments that would hurt whoever/whatever I'm angry/upset at. I never actually say them to anyone but me, but it lets out all my fury in a better way than I was before: Namely, hitting the person/thing that had made me angry/upset. Normally, they were way physically bigger than me, so that was a lose-lose situation for me. My new method has so much less embarrassing public displays.