Athletes Breaking Bones
Why It's Appealing: Though this genre overlaps with the previous category, it is a more classic form of Schadenfreude. The shocking realization that someone could be so fast/strong/physically enabled as to damage themselves so severely is also awesome. (Compare the above to a mere mortal slipping on ice while toddling across the sidewalk. Bo-ring.)
If You Can't Look Away: Sports fans, those who enjoy Discovery Channel Medical Mysteries, those who fear pain and enjoy torturing themselves.
When You Tire of This Try: Contortionists.