As a therapist, I am frequently working with children who are emotionally dysregulated and lack the skills to cope. This means, I see a lot of behavioral issues, difficulties containing behaviors, emotions, and reacting instead of responding to difficult situations.
My favorite example is when a parent makes a grilled cheese sandwich when the child really wanted turkey, and the child throws a fit and ends up on the floor, crying, thrashing, and believing it is the worst day of his or her life. Yes, this is truly how such a child feels. The individual has little to no ability to cope with small (or big) stressors, and instead, acts out.