Rage
I've thought about this before, but it really struck me today hard, due to some nastiness that remains unresolved: Virtually the only thing that gets me into a real rage - I mean the kind of visceral, palpable rage that leaves you shaking (see: icon) - is injustice against people I care about. Of course, Julia is first on that list (see: above), but probably a good criterion of whether I consider someone to be a good friend or not is whether I would be physically outraged (i.e. beyond the mental or rational level) if something unfair were happening to them. Moreover, I will fight with all my essence to remedy those injustices, if it is within my power. And I know how to use that rage to my advantage, and you better keep the hell out of my path when I decide to put it to use.