saying 'passion' is lame-o, sorry guys. It's so vague!
I have to admit that for me, anger is the no-brainer. Choleric by uh, nature and uh, well possibly by name, depending who you talk to.
But then the anger drives other things. Anger usually, at injustices, prejudices, hypocrisy and such like... makes me rebel most ostentatiously and in such a way as to draw attention (the more unwelcome for those concerned, the better), and force change for the better, if at all possible.
If you mean on an individual level, it's still probably anger and its close cousin, frustration. And the most likely things to elicit it/them are: telling me what I think ("you think I'm stupid, you think... blah blah blah" etc) and judging me. Not judging what I do or say so much as judging the motives behind it, often without even consulting me. If you say I screwed up then fine, I can take that. I know I make mistakes as much as the next person. But what I won't accept is when someone tries to make out that I screwed up by intentionally wishing harm to others, like I deliberately calculated the most devious and nasty course of action, regardless of what I might say in my defense.
If I can tell that you're doing this on purpose though, to get a reaction from me, all you'll get is laughter. I'm many things, lots of them bad, but I'm not fucking stupid.
But yeah, to the whole idea of feeling things in retrospect, not realizing things are there at all, or if I do, not realizing that they're actually emotions until long, long, long after. years, even.