If a rabbit's foot brings a little good luck...

The subject of this story about a couple's discovery of a decomposing human hand in a storage shed is odd enough without the unnamed author describing the find as a "windfall."  

The term comes from ripe fruit knocked to the ground by wind, a stroke of luck, apparently, for ladder-worn harvesters.  It has come to refer to any "unexpected, unearned, or sudden gain or advantage."  

Update: 

It seems that Jason Kowtowski doesn't appreciate what great luck it is to stumble upon a human hand.  He has written a longer story sans windfall reference.