How is death by accident related to happiness?
Seriously, I know many people who got injured doing a sport they enjoy and then immediately went back to it, without being particularly unhappy. I don't personally know anyone who died from an accident like this, but I imagine that someone can absolutely die while doing something that makes them happy.
I'm not sure what I feel about this. On the one hand, it's definitely a kind of a Darwin award, but on the other hand, I see this as exemplifying living life to the fullest.