Have you ever seen me really, truly mad?
If yes, how would you describe it?
If you picked "Not sure," then the answer is no.
The "piss off!" icon is me trying to approximate my dirty look -- I give the best dirty looks in the business -- but when I'm really mad, that look's a lot dirtier.
And I'm willing to bet money that the people who know me the best will vote towards the high end of the scale.