Sometimes we human beings get caught in negative thoughts and that causes us much unhappiness. You might hear yourself say, "I can't do anything right." Or, with great anger, "How can he be so selfish?" You might even hear, "Why doesn't she understand that I'm right and she is wrong."
When we listen to these negative thoughts in meditation we observe that they can come in bursts of anger and streams of frustration. We observe that they can be directed outward toward others or inward toward the self.
Caught in illusion, many people assume that this negativity is their problem. And they assume they have to get rid of it to feel happy. Negativity isn't a thing can be owned. Instead it's an activity that comes and goes.