That adage perfectly describes the situation in Los Angeles surrounding outfielder Yasiel Puig. He is still one of the most dynamic players in the game and he's only 22. But Puig has worn out his welcome with the Dodger organization and the club would love to move him for a number three or four starter.
Enter the Mets.
The Mets have more pitching then they know what to do with. Even after Bartolo Colon is likely gone after this season, Zack Wheeler will return to what has turned into a six-man rotation (much to Matt Harvey's dismay).
I would trade Jon Niese (and a prospect, if necessary) to get Puig. I think the Dodgers would go for it, because it would give them two outstanding pitchers and a true number three as they head into the postseason. And Puig is just made-to-order for New York, with his natural skills and flamboyant style of play.
With the Mets just two games back, and no guarantees they will have the kind of dominant pitching they have now in future seasons, this is a low risk-high reward chance they've got to take.