Red Chair

It's been my experience that any sort of negative energy, whether anger or depression or stress or whatever, is completely unproductive.
No, that's a lie. Channeling that energy, handling it maturely and carefully, even using it to sort of add conviction to your argument-- that kinda thing is okay. It's dwelling on it, over- or under-analyzing it, acting on it too hastily, etc. that has the potential to really cause problems.
That said, I'm gonna kinda copy Greg's idea (sorry that I always reference other students' posts) and tell a story from when I was little, to fully illustrate the immaturity and pettiness in angry words:
From the time we moved to Kentucky (I was, like, two or three) to the time I started school, I went to KinderCare. During those three-ish years, there was always a single red chair, the rest were ugly colors like brown and blue.
I always got the read chair. Not to sound like a brat. It just worked out that way because we would typically use them during Circle after naptime, and I never napped and always got over there first. Plus, people may have been a little scared of me; I pushed a boy off the slide once (another instance of unnecessary execution-- exertion?-- of anger, although probably the single exception because that boy bit everyone, so teachers and peers were pretty happy with me).
But anyway, red chair, basically mine. I can't remember details-- and probably shouldn't get into them, anyway, so I can sort of abide by this 150-word deal-- but some chick got the red chair one day and I threw a fit. And then my mom saved the note that got sent home about it, which is embarrassing, much more embarrassing than sitting in a stupid blue chair would've been.