the specific message anger conveys typically has to do w/ boundary violations; your perceived coherence is somehow being impinged upon. this can happen in three ways:
1. your sense of self is over-extended
2. you are not enforcing your boundaries adequately
3. an actual violation
the last one does indeed happen, but I'd be willing to bet the former two are much more common; I know i experience both regularly. through introspection and effort, it is possible to minimize their occurrence, increasing your anger's signal/noise ratio
this is controversial