O.k. all you ignorants that just think this is just made up, picture yourself stopping at a stop sign that seems pointless and getting pissed off to the point that you can't control your actions.  You're so pissed that you have to punch, smash or just fuck something up in general just so you don't take someone's life instead.  That's anger on an irrational level. That's IED, and it accompanies other mental disorders (most commonly anxiety from what I've gathered) High testosterone levels have also been known to cause this. It's more or less a side affect of another condition.