Classicly

Everybody wanted Joey, naturally. I'd have wanted him myself if I hadn't learned from the Mimasan natives, who are as rare as smileys and a damned sight less friendly, that chewing khiff roots would immunize me against his hypnotic aura. That aura makes smileys remarkable even among Eetees, so remarkable that nobody had ever brought one in before. It's their mating call, a very practical gimmick evolved to attract each other and at the same time protect themselves from native predators while they carry on their courtship. It works on anything from swamp gnats to Syrtis Major sand snakes, and it's literally irresistible.