Have I left something behind ?

I read about this guy in newspaper today...
he is a security guard...but he is also a part-time actor...he donates blood 20+ times...he donates his sperm...he poses nude for artists...publish a book...
and maybe many other things...
he is single...low income...but does so many things...
just one thing that he said is quite touching...
'I've left something behind'
...
not everyone does...