Actors can often be a spiteful bunch, and while Woody Harrelson wouldn’t be the first name that comes to mind, he did play a role so challenging that he’d only wish it upon his worst enemies. Any contemporaries that he appreciates or admires? He’d advise them to stay well clear, but for anyone unfortunate enough to be on Harrelson’s shit-list who came to him for advice? He’d take the opposite route, and tell them that it was an experience worth …