Your brain is uncharted territory, but I feel confident stating that it can only contain a specific, given amount of fear or anger at any singular point in time.
In other words, your negative emotions fill up a figurative balloon. It will pop if you don’t release them soon enough.
So the next time you throw an object or pound your fist in anger over something trivial, ask yourself what else is going on in your life that you are either afraid of, or angry about?
It might be something you’ve become very good at keeping out of your conscience thoughts, such as:
“I’m afraid of losing my house.”
“I’m angry at my father.”
“I’m procrastinating that meeting with my boss.”
Whatever it is, it might not have been the little pin that burst the bubble today, but it sure did fill it up most of the way beforehand.