"Yes. He is a hard man, and he judges his fellows solely by their devotion to fish. I never in my life met a man so wrapped up in a subject. For years he has been practically a monomaniac on the subject of fish. So much so that he actually looks like one. It is as if he had taken one of those auto-suggestion courses and had kept saying to himself, 'Every day, in every way, I grow more and more like a fish.' His closest friends can hardly tell now whether he more nearly resembles a halibut or a cod. . . . But I am boring you again with this family gossip?"
(from Leave It To Psmith, by Sir Pelham Wodehouse)