I think that anyone who knows how to hold a grudge knows what it's like to wish to remain angry at someone. I mean something like the following:
1. You're angry at someone.
2. Since you're angry, you'd like to punish or otherwise get back at this
3. But you know that this can't happen if your feelings cool and you lose
4. So part of your plan for revenge consists precisely in remaining angry.
5. In this way, anger takes itself as an objective.
Accordingly, there is an odd feeling of disappointment you get when you inevitably calm down ("Don't give up! Stay mad!"). Is there something irrational about thinking this way?