Quote from MCMXCIXI guess I never really thought about that. I don't really see how me killing Diablo on Hardcore Inferno helps me or anyone else in real life, though... other than for ego, e-peen, and all that.
How about staying calm und focussed on a task where you cant effort errors for many, many hours.
Setting a very hard long-term goal and managing to pull it off.
Teaming up with others, even strangers, to get something done.
And many more... but I'm not 100% sure people are always able to transfer that dedication to their real lives. But the skills that are used in a Diablo Hardcore Inferno are something very useful when doing our daily jobs.