It happens at almost every college party at least once. It's late. Everyone's been drinking heavily, and inhibitions are slow. Suddenly, someone erupts into anger over a perceived offense by another person. They start to argue, and before you know it, they're rolling around on the ground in a full-on fight.
The majority of personal injury cases involve negligence--e.g., a doctor failing to properly diagnose a patient, or a driver falling asleep at the wheel--which results in pain and suffering for the plaintiff. However, some types of personal injury are inflicted intentionally.