One of the trickiest things to deal with sometimes is the strong emotions of a character. It's easy to get their words out in these situations, but harder to relay their actions. The problem is that writing is a controlled medium, and having to express uncontrolled rage can be difficult within the confines of language.
I'm dealing with a lot of this in the manuscript I'm currently working on. Tensions run high in the story and I find myself consistently tangled in the frustrations of my characters. And though I do have ways of showing these feelings that I've developed over the years, I try my best not to revert to old habits that simply say things that I've already said.
The art of anger is subtle, despite the action being very primal.