Not all brains are equal, especially for those that have been knocked about significantly more than others. The risk of dementia becomes especially high for people who are exposed to head trauma. This can of course include automobile accidents or otherwise unforeseen tragedies, but especially those in high-impact sports who are chronically experiencing hits to the skull. Dementia pugilistica (though originating from boxing/pugilism) is an umbrella term for what can happen to professional athletes who play sports such as football, hockey, ruby, and of course boxing. Boxers are the leading demographic of DP, with about 20% of professional boxers ending up with some form dementia.