I used to be very volotile, but not so much now I've grown out of the omgihavehormone stage.
Well, recently I've been really tetchy but I put that down to the stress of exams.

What makes me cross though, is when people interrupt my plans. Especially if it is a parent with chores for me. I like having my routine set aside in my head and if anyone comes up with 'can you do this for me' I get rather wound up. Not angry, just frustrated.

But aside from the unpredictable nature of humanity, I'm fairly calm.

Chaos