yeah... i go with nochowder on this one.
i am a very mellow person.. and almost nothing pisses me off. but i get strong urges to kill things (mainly people) around me. i found that martial arts helped with this... im not sure how though.. but iv been a tai kwan do black belt for a little over half a year, and have taken up akido.
if none of this helps.. go to a doctor or a therapist to mellow out.